ADATA XPG SX900 Solid State Drive Review

Manufacturer: ADATA Technology Co., Ltd
Product Name: XPG SX900 Solid State Drive
Model Number: ASX900S3-256GM-C (256GB Capacity)
UPC: 713435794739 (256GB) 713435794746 (512GB)
Prices: 64GB (Newegg / Amazon), 128GB (Newegg / Amazon), 256GB (Newegg / Amazon), 512GB (Newegg / Amazon)

Full Disclosure: The product sample used in this article has been provided by ADATA.

Until recently, all SandForce-based solid state drive storage products came with a reserved NAND flash capacity referred to as 'Over Provisioning', used for low-level tasks by the SSD controller. Available now with the ADATA XPG SX900 series, a LSI-SandForce 2281-based solid state drive, capacity grows 7% larger thanks to new firmware that specifies binary capacity points while preserving performance. In this article, Benchmark Reviews tests the value-priced 256GB ADATA XPG SX900 SSD (model ASX900S3-256GM-C).

ADATA knows that SandForce-driven SSDs are a win-win combination of performance and speed. In this article, Based on the popular SandForce SF-2281 SATA 6Gb/s controller and fast IMFT-branded NAND flash components, ADATA claims the SX900 is capable of 550 MB/s read and 530 MB/s write speed with 4K random write speeds as high as 90,000 IOPS in real world testing. We test these claims, and compare performance to competing storage solid-state solutions in this review to find out which SSD is best.

The second-generation SF-2281 SSD processor maintains all of the original core technology SandForce originally introduced in the SF-1200 series, but now improves SSD performance with 20% faster IOPS and 40% faster sequential read/write throughput. They've enhanced BCH ECC capability, and the new processor now supports ATA-7 Security Erase. Finally, the new SF-2200 series implements cost-effective 20nm-class NAND flash from all leading flash vendors with Asynch/ONFi1/ONFi2/Toggle interfaces.

Solid State vs Hard Disk

Despite decades of design improvements, the hard disk drive (HDD) is still the slowest component of any personal computer system. Consider that modern desktop processors have a 1 ns response time (nanosecond = one billionth of one second), while system memory responds between 30-90 ns. Traditional hard drive technology utilizes magnetic spinning media, and even the fastest spinning mechanical storage products still exhibit a 9,000,000 ns / 9 ms initial response time (millisecond = one thousandth of one second). In more relevant terms, the processor receives the command and must then wait for system memory to fetch related data from the storage drive. This is why any computer system is only as fast as the slowest component in the data chain; usually the hard drive.

In a perfect world all of the components operate at the same speed. Until that day comes, the real-world goal for achieving optimal performance is for system memory to operate as quickly as the central processor and then for the storage drive to operate as fast as memory. With present-day technology this is an impossible task, so enthusiasts try to close the speed gaps between components as much as possible. Although system memory is up to 90x (9000%) slower than most processors, consider then that the hard drive is an added 1000x (100,000%) slower than that same memory. Essentially, these three components are as different in speed as walking is to driving and flying.

Solid State Drive technology bridges the largest gap in these response times. The difference a SSD makes to operational response times and program speeds is dramatic, and takes the storage drive from a slow 'walking' speed to a much faster 'driving' speed. Solid State Drive technology improves initial response times by more than 450x (45,000%) for applications and Operating System software, when compared to their mechanical HDD counterparts. The biggest mistake PC hardware enthusiasts make with regard to SSD technology is grading them based on bandwidth speed. File transfer speeds are important, but only so long as the operational IOPS performance can sustain that bandwidth under load.

Bandwidth Speed vs Operational Performance

As we've explained in our SSD Benchmark Tests: SATA IDE vs AHCI Mode guide, Solid State Drive performance revolves around two dynamics: bandwidth speed (MB/s) and operational performance (IOPS). These two metrics work together, but one is more important than the other. Consider this analogy: bandwidth determines how much cargo a ship can transport in one voyage, and operational IOPS performance is how fast the ship moves. By understanding this and applying it to SSD storage, there is a clear importance set on each variable depending on the task at hand.

For casual users, especially those with laptop or desktop computers that have been upgraded to use an SSD, the naturally quick response time is enough to automatically improve the user experience. Bandwidth speed is important, but only to the extent that operational performance meets the minimum needs of the system. If an SSD has a very high bandwidth speed but a low operational performance, it will take longer to load applications and boot the computer into Windows than if the SSD offered a higher IOPS performance.

Closer Look: ADATA XPG SX900 SSD Series

SSDs are quickly gaining popularity because they work equally well in PC, Linux, or Apple computers. Likewise, they easily install into both desktop and notebook platforms without modification. For this article Benchmark Reviews is testing the ADATA XPG SX900 Solid State Drive, which is specified to reach speeds of 550 MB/s for sequential reads and 530 MB/s sequential writes. The 256GB model we received for testing is built using the LSI-SandForce SF-2281 SSD controller and 25nm synchronous Intel-Micron NAND flash components. The ADATA XPG SX90 uses synchronous NAND flash components, which offers higher performance when compared to the asynchronous NAND flash inside other SSDs.

ADATA offers several capacities for their SX900-series solid state drives: 64GB, 128GB, 256GB, and 512GB. Performance specifications improve with capacity and peak at 256GB, which will help drive consumers to the larger models. The ADATA XPG SX900 measures 3.94"/100mm long, by 2.76"/70mm wide, by 0.37"/9.5mm tall.

The ADATA XPG SX900 SSD is best suited for performance-orientated personal computers, but could also work well for SOHO computer workstation systems. LSI-SandForce SF-2200 series SSDs have been designed with a focus on high-performance operational and data transfer speeds, and includes 256-bit encrypted data protection and improved NAND wear-leveling through their proprietary DuraWrite technology.

Although ADATA XPG SX900-series SSDs do not offer an integrated USB Mini-B port, which appeared on some early-generation SSDs, the retail market offers several different 2.5" SATA enclosures that utilize the SuperSpeed USB-3.0 standard for high-performance portable file transfers.

ADATA recognizes that once installed, the SSD will be hidden away from view inside a notebook computer or desktop workstation, so they've remained conservative towards the design of their solid state drive's appearance. Each half of the drive enclosure is given a textured brushed aluminum finish, which does not show fingerprints or smudges like a glossy painted surface would. ADATA branding is marked at the top of the SSD enclosure, with a label attached to the bottom that denotes model and capacity.

Standard 2.5" drive bay mounting points are pre-drilled and threaded into the ADATA XPG SX900 SSD chassis, which allows for quick upgrade or addition into any existing notebook and other compact computer system. Using a universal 3.5" to 2.5" tray adapter (included with this kit), the SSD fits easily into desktop computers. The mounting positions matched up to the drive bracket on my notebook computer, and after only a few minutes I was booting from a restored Windows 7 System Image with ease.

Unlike most Hard Disk Drive (HDD) storage products, SSDs are nearly impervious to impact damage and do not require (or benefit from) any kind of special vibration dampening or shock-proof enclosures. ADATA utilizes a standard two-piece metal enclosure for their ADATA XPG SX900-series SSDs, which reveals the internal components after removing four small counter-sunk screws located along the sides of this solid state drive. On the underside a screw is covered by a 'Warranty Void' label that is attached to warn consumers against taking apart their product. By removing the SSD cover it will also remove your consumer protection with it.

LSI-SandForce introduced their new second generation solid state drives to both consumer and enterprise segments, with seven different processor models to choose from. On the consumer (retail) side you've got models using the older SATA 3Gb/s interface as well as the latest SATA 6Gb/s interface, while all enterprise drives utilize the 3rd-generation SATA 6Gb/s interface. More than any other factor, it's the Flash Channels/Byte Lanes configuration that these separate models. LSI-SandForce's SF-2000 series of SSDs continue to feature up to 8 data channels organized into 16 Byte lanes; similar to the previous generation of SF-1222/SF-1565 series SSD controllers, but now some models are scaled down for usage scenarios not requiring massive IO activity.

On second-generation LSI-SandForce-driven SSDs, a new SATA 6Gb/s LSI-SandForce SF-2281VB1-SDC processor is part of their SF-2200 family of retail SSD controller chips, although and identical SF-2181 processor exists for older SATA 3Gb/s connections. Offering 8 flash channels with 8 Byte lanes configured (one lane per channel), the SF-2281 maintains a BGA-256 package whereas the top-end SF-2282 delivers two lanes per channel on a BGA-400 package. More detail is available in our LSI-SandForce SF-2000 Series SSD Processor Overview article.

LSI-SandForce SF-2281VB1-SDC Controller

All LSI-SandForce SSD controllers offer native TRIM garbage collection in supporting Operating System (such as Microsoft Windows-7), Native Command Queuing (NCQ) with 32 command slots, and basic Self-Monitoring, Analysis, and Reporting Technology (SMART) command set. LSI-SandForce built the SF-2200 series to produce 500 MB/s sequential read and write bandwidth with 60K (burst)/20K (sustained) IOPS random write (4K transfers). The firmware controls the performance variables on LSI-SandForce SSDs, and some manufacturers have licensed custom firmware to unlock additional performance for their products.

The SF-2200 SSD processor provides enhanced ECC with BCH data protection, and also includes LSI-SandForce's unique RAISE (Redundant Array of Independent Silicon Elements) technology. RAISE provides the protection and reliability of RAID on a single SSD drive, thanks to flash architecture, without the significant write overhead of parity. The LSI-SandForce DuraClass technology automatically stores data using Trusted Computing Group (TCG) OPAL security with 256-bit AES encryption and automatic, line-rate double encryption with a drive-level password, preventing data extraction directly from the physical flash memory modules.

Micron 29F128G08CFAAB Synchronous NAND Flash

LSI-SandForce processors enable support for advanced 30nm- and 20nm-class NAND flash from all leading flash vendors with synch/asynch/ONFi1/ONFi2/toggle interfaces that offer data transfer rates up to 166 Mega Transfers per second. Their latest generation of controllers also offers advanced ECC engine correcting up to 55 bits per 512-byte sector to assure high data integrity and support for future generations of flash memory. On the 256GB ADATA XPG SX900 SSD, sixteen multi-layer cell Intel/Micron Flash Technology (IMFT) 29F16B08CCME3 synchronous NAND Flash modules are joined to the LSI-SandForce SF-2281 controller..

ADATA XPG SX900 Features

The XPG (Xtreme Performance Gear) SX900 solid state drive is an expanded capacity SSD which uses new optimized firmware to utilize greater storage capacity of the NAND Flash components. With superior NAND Flash, the XPG SX900 SSD reaches new levels of stability and performance. The drive breaks new ground in storage capacity for SSDs utilizing the SandForce 2281 controller, reaching 512GB, a 7% increase over common SSDs in the market that use a SandForce controller. This represents a milestone in ADATA's history of NAND Flash based products.

Source: ADATA

LSI-SandForce SF-2200 Features

Endurance and Longevity
As each generation of flash memory evolves and the silicon geometries shrink - performance, reliability, endurance, and data retention are negatively impacted. DuraWrite technology extends the life of the SSD over conventional controllers, by optimizing writes to the flash memory and delivering a write amplification below 1, without complex DRAM caching requirements.

Performance and Power Optimization
SSDs are capable of significantly outperforming traditional HDDs, but typical controllers haven't delivered the compelling value necessary for mainstream adoption. LSI-SandForce DuraClass technology enables the SSD to maximize both the endurance and performance for the life of the drive fulfilling the promise of high speed flash memory in client computing applications and improving system performance by up to 50% as measured by the SYSmark Benchmark.

Mobile Computing Security
The SF-2200 series has built in AES-256 bit double encryption controllable by a configurable user password. This feature prevents would-be thieves from extracting data directly from the flash memory should they ever have access to the drive.

Data Protection and Reliability
SF-2200 SSD Processors provide up to 100x greater data protection than today's SSDs, and leading enterprise HDDs. This is a result of superior ECC protection and unique RAISE (Redundant Array of Independent Silicon Elements) technology. RAISE provides the protection and reliability of RAID on a single drive without the significant write overhead.

Source: LSI-SandForce Technology

ASX900S3 Specifications

SSD Testing Methodology

Solid State Drives have traveled a long winding course to finally get where they are today. Up to this point in technology, there have been several key differences separating Solid State Drives from magnetic rotational Hard Disk Drives. While the DRAM-based buffer size on desktop HDDs has recently reached 64 MB and is ever-increasing, there is still a hefty delay in the initial response time. This is one key area in which flash-based Solid State Drives continually dominates because they lack moving parts to "get up to speed".

However the benefits inherent to SSDs have traditionally fallen off once the throughput begins, even though data reads or writes are executed at a high constant rate whereas the HDD tapers off in performance. This makes the average transaction speed of a SSD comparable to the data burst rate mentioned in HDD tests, albeit usually lower than the HDD's speed.

Comparing a Solid State Disk to a standard Hard Disk Drives is always relative; even if you're comparing the fastest rotational spindle speeds. One is going to be many times faster in response (SSDs), while the other is usually going to have higher throughput bandwidth (HDDs). Additionally, there are certain factors which can affect the results of a test which we do our best to avoid.

SSD Testing Disclaimer

Early on in our SSD coverage, Benchmark Reviews published an article which detailed Solid State Drive Benchmark Performance Testing. The research and discussion that went into producing that article changed the way we now test SSD products. Our previous perceptions of this technology were lost on one particular difference: the wear leveling algorithm that makes data a moving target. Without conclusive linear bandwidth testing or some other method of total-capacity testing, our previous performance results were rough estimates at best.

Our test results were obtained after each SSD had been prepared using DISKPART or Sanitary Erase tools. As a word of caution, applications such as these offer immediate but temporary restoration of original 'pristine' performance levels. In our tests, we discovered that the maximum performance results (charted) would decay as subsequent tests were performed. SSDs attached to TRIM enabled Operating Systems will benefit from continuously refreshed performance, whereas older O/S's will require a garbage collection (GC) tool to avoid 'dirty NAND' performance degradation.

It's critically important to understand that no software for the Microsoft Windows platform can accurately measure SSD performance in a comparable fashion. Synthetic benchmark tools such as ATTO Disk Benchmark and Iometer are helpful indicators, but should not be considered the ultimate determining factor. That factor should be measured in actual user experience of real-world applications. Benchmark Reviews includes both bandwidth benchmarks and application speed tests to present a conclusive measurement of product performance.

Test System

• Motherboard: ASUS P8P67 EVO (Intel P67 Sandy Bridge Platform, B3 Stepping)
• Processor: Intel Core i7-2600K 3.4 GHz Quad-Core CPU
• System Memory: 4GB Dual-Channel DDR3 1600MHz CL6-6-6-18
• SATA 6Gb/s Storage HBA: Integrated Intel P67 Controller
  • AHCI mode - Intel Rapid Storage Technology Driver 11.7.0.1013
• SATA 3Gb/s Storage HBA: Integrated Intel P67 Controller
  • AHCI mode - Intel Rapid Storage Technology Driver 11.7.0.1013
• Operating System: Microsoft Windows 7 Ultimate Edition 64-Bit with Service Pack 1

Storage Hardware Tested

The following storage hardware has been used in our benchmark performance testing, and may be included in portions of this article:

• ADATA S599 100GB SATA MLC SSD
• ADATA S511 Solid State Drive AS511S3
• ADATA XPG SX900 ASX900S3-256GM-C SATA MLC SSD
• Crucial RealSSD-C300 CTFDDAC256MAG-1G1 256GB SATA 6Gb/s MLC SSD
• Crucial m4 CT256M4SSD2 256GB SATA 6Gb/s MLC SSD
• Intel X25-E Extreme SSDSA2SH032G1GN SATA SLC SSD
• Intel SSD 311 Series Larson Creek SSDSA2VP020G2E
• Intel SSD 320 Series MLC Solid State Drive SSDSA2CW160G3
• Intel SSD 520 Series MLC Solid State Drive SSDSC2CW240A3
• OCZ Agility OCZSSD2-1AGT120G 120GB SATA MLC SSD
• OCZ Agility 2 'Extended' OCZSSD2-2AGTE120G 120GB MLC SSD
• OCZ Agility 3 AGT3-25SAT3-240G 240GB MLC SSD
• OCZ Octane OCT1-25SAT3-512G 512GB MLC SSD
• OCZ RevoDrive OCZSSDPX-1RVD0120 120GB MLC PCI-Express SSD
• OCZ RevoDrive X2 OCZSSDPX-1RVDX0240 240GB MLC PCI-E SSD
• OCZ RevoDrive3 X2 RVD3X2-FHPX4-480G 480GB MLC PCI-E SSD
• OCZ Vertex OCZSSD2-1VTX120G 120GB SATA SSD
• OCZ Vertex Turbo OCZSSD2-1VTXT120G 120GB SATA SSD
• OCZ Vertex 2 'Extended' OCZSSD2-2VTXE120G 120GB MLC SSD
• OCZ Vertex 3 VTX3-25SAT3-240G 240GB MLC SSD
• OCZ Vertex 3 Max IOPS VTX3MI-25SAT3-240G MLC SSD
• OCZ Vertex 4 VTX4-25SAT3-256G SATA SSD
• Patriot Inferno PI100GS25SSDR 100GB MLC SSD
• Patriot Torqx 2 PT2128GS25SSDR 128GB MLC SSD
• Patriot Wildfire PW120GS25SSDR 120GB MLC SSD
• Patriot Pyro SE PPSE240GS25SSDR 240GB MLC SSD
• Seagate Momentus XT Hybrid ST750LX003 750GB SSHD
• Seagate Barracuda-XT ST32000641AS 2TB 7200RPM SATA 6Gb/s Hard Drive
• Western Digital VelociRaptor WD3000HLFS 300GB 10,000 RPM SATA Hard Disk Drive
• WD SiliconEdge-Blue SSC-D0256SC-2100 256GB SATA SSD

Test Tools

• AS SSD Benchmark 1.6.4067.34354: Multi-purpose speed and operational performance test
• ATTO Disk Benchmark 2.46: Spot-tests static file size chunks for basic I/O bandwidth
• CrystalDiskMark 3.0.1a by Crystal Dew World: Sequential speed benchmark spot-tests various file size chunks
• Iometer 1.1.0 (built 08-Nov-2010) by Intel Corporation: Tests IOPS performance and I/O response time
• Lavalys EVEREST Ultimate Edition 5.50: Disk Benchmark component tests linear read and write bandwidth speeds
• Futuremark PCMark Vantage 1.02: HDD Benchmark Suite tests real-world drive performance

Test Results Disclaimer

This article utilizes benchmark software tools to produce operational IOPS performance and bandwidth speed results. Each test was conducted in a specific fashion, and repeated for all products. These test results are not comparable to any other benchmark application, neither on this website or another, regardless of similar IOPS or MB/s terminology in the scores. The test results in this project are only intended to be compared to the other test results conducted in identical fashion for this article.

AS-SSD Benchmark

Alex Schepeljanski of Alex Intelligent Software develops the free AS SSD Benchmark utility for testing storage devices. The AS SSD Benchmark tests sequential read and write speeds, input/output operational performance, and response times. Because this software receives frequent updates, Benchmark Reviews recommends that you compare results only within the same version family.

Beginning with sequential transfer performance, the ADATA XPG SX900 solid state drive produced speeds up to 507.71 MB/s for reads and 317.53 MB/s writes. Because this benchmark uses compressed data, sequential file transfer speeds are reported lower than with other tools using uncompressed data. For this reason, we will concentrate on the operational IOPS performance for this section. Single-threaded 4K IOPS performance tests deliver 19.66 MB/s read and 62.85 MB/s write, while the 64-thread 4K reads recorded 186.50 MB/s and write performance was 236.46 MB/s.

AS-SSD 64-thread 4KB IOPS performance results are displayed in the chart below, which compares several enthusiast-level storage products currently on the market. In these 64-thread 4KB IOPS performance tests the ADATA XPG SX900-series did not outperformed many other SSDs, but did surpass the older Indilinx Barefoot and SandForce models. The chart below is sorted by total combined performance, which helps illustrate which products offer the best operational input/output under load:

In the next section, Benchmark Reviews tests transfer rates using ATTO Disk Benchmark.

ATTO Disk Benchmark

The ATTO Disk Benchmark program is free, and offers a comprehensive set of test variables to work with. In terms of disk performance, it measures interface transfer rates at various intervals for a user-specified length and then reports read and write speeds for these spot-tests. There are some minor improvements made to the 2.46 version of the program that allow for test lengths up to 2GB, but all of our benchmarks are conducted with 256MB total length. ATTO Disk Benchmark requires that an active partition be set on the drive being tested. Please consider the results displayed by this benchmark to be basic bandwidth speed performance indicators.

ATTO Disk Benchmark: Queue Depth 4 (Default)

Our bandwidth speed tests begin with the ADATA XPG SX900 solid state drive attached to the Intel P67-Express SATA 6Gb/s controller operating in AHCI mode. Using the ATTO Disk Benchmark tool, the test drive performs basic file transfers ranging from 0.5 KB to 8192 KB. This 256GB model reports 558 MBps maximum read speeds that plateau from about 512-8192 KB file chunks, and 532 MBps peak write bandwidth plateaus from 64-8192 KB. These results exceed ADATA's performance specifications of 550/530 MBps for the 256GB XPG SX900 model.

In the next section, Benchmark Reviews tests sequential performance using the CrystalDiskMark 3.0 software tool...

CrystalDiskMark 3.0 Tests

CrystalDiskMark 3.0 is a file transfer and operational bandwidth benchmark tool from Crystal Dew World that offers performance transfer speed results using sequential, 512KB random, and 4KB random samples. For our test results chart below, the 4KB 32-Queue Depth read and write performance was measured using a 1000MB space. CrystalDiskMark requires that an active partition be set on the drive being tested, and all drives are formatted with NTFS on the Intel P67 chipset configured to use AHCI-mode. Benchmark Reviews uses CrystalDiskMark to illustrate operational IOPS performance with multiple threads. In addition to our other tests, this benchmark allows us to determine operational bandwidth under heavy load.

CrystalDiskMark uses compressed data in its benchmark tests, so sequential file transfer speeds appear lower compared to those tested with other tools using uncompressed data. This section concentrates on operational IOPS performance using compressed data.

CrystalDiskMark 3.0 reports sequential speeds reaching 487.1 MB/s reads and 325.7 MB/s writes. 512K test results reached 420.0 MB/s read and 319.2 MB/s write performance. 4K tests produced 32.18 read and 76.49 write performance. All of these results are significantly better than many previous generationsolid state drive storage products.

Maximum 4KB IOPS performance results at queue depth 32 are reported in the chart below. These values represent the performance levels for several enthusiast-level storage solutions, and illustrates which products offer the best operational performance under load:

In the next section, we continue our testing using Iometer to measure input/output performance...

Iometer IOPS Performance

Iometer is an I/O subsystem measurement and characterization tool for single and clustered systems. Iometer does for a computer's I/O subsystem what a dynamometer does for an engine: it measures performance under a controlled load. Iometer was originally developed by the Intel Corporation and formerly known as "Galileo". Intel has discontinued work on Iometer, and has gifted it to the Open Source Development Lab (OSDL). There is currently a new version of Iometer in beta form, which adds several new test dimensions for SSDs.

Iometer is both a workload generator (that is, it performs I/O operations in order to stress the system) and a measurement tool (that is, it examines and records the performance of its I/O operations and their impact on the system). It can be configured to emulate the disk or network I/O load of any program or benchmark, or can be used to generate entirely synthetic I/O loads. It can generate and measure loads on single or multiple (networked) systems.

To measure random I/O response time as well as total I/O's per second, Iometer is set to use 4KB file size chunks over a 100% random sequential distribution at a queue depth of 32 outstanding I/O's per target. The tests are given a 50% read and 50% write distribution. While this pattern may not match traditional 'server' or 'workstation' profiles, it illustrates a single point of reference relative to our product field.

All of our SSD tests used Iometer 1.1.0 (build 08-Nov-2010) by Intel Corporation to measure IOPS performance, using a SandForce-created QD30 configuration: 4KB 100 Random 50-50 Read and Write.icf. The chart below illustrates combined random read and write IOPS over a 120-second Iometer test phase, where highest I/O total is preferred:

In our Iometer tests, which are configured to use 32 outstanding I/O's per target and random 50/50 read/write distribution, SandForce SSDs generally outperform the competition when tested with this large queue depth. Ultra high-end PCI-Express SSDs top our results, while the OCZ Vertex 4 SSD delivered the best combined IOPS performance we've seen from any SATA-based SSD with 83,494. The 240GB OCZ Vertex 3 Max IOPS Edition trails behind with 83,117 IOPS, while the Intel SSD 520 Series produced 80,433 peak combined IOPS. This 256GB ADATA XPG SX900 kept pace with the leaders, delivering 79,820 combined IOPS. All of our top performers deliver I/O far beyond the needs of multi-tasking power users and hardcore gamers, and would be ideal for systems running several virtual machines.

In our next section, we test linear read and write bandwidth performance and compare its speed against several other top storage products using EVEREST Disk Benchmark. Benchmark Reviews feels that linear tests are excellent for rating SSDs, however HDDs are put at a disadvantage with these tests whenever capacity is high.

EVEREST Disk Benchmark

Many enthusiasts are familiar with the Lavalys EVEREST benchmark suite, but very few are aware of the Disk Benchmark tool available inside the program. The EVEREST Disk Benchmark performs linear read and write bandwidth tests on each drive, and can be configured to use file chunk sizes up to 1MB (which speeds up testing and minimizes jitter in the waveform). Because of the full sector-by-sector nature of linear testing, Benchmark Reviews endorses this method for testing SSD products, as detailed in our Solid State Drive Benchmark Performance Testing article. However, Hard Disk Drive products suffer a lower average bandwidth as the capacity draws linear read/write speed down into the inner-portion of the disk platter. EVEREST Disk Benchmark does not require a partition to be present for testing, so all of our benchmarks are completed prior to drive formatting.

Linear disk benchmarks are superior bandwidth speed tools in my opinion, because they scan from the first physical sector to the last. A side affect of many linear write-performance test tools is that the data is erased as it writes to every sector on the drive. Normally this isn't an issue, but it has been shown that partition table alignment will occasionally play a role in overall SSD performance (HDDs don't suffer this problem).

The high-performance storage products we've tested with EVEREST Disk Benchmark are connected to the Intel P67-Express SATA 6Gb/s controller and use a 1MB block size option. Read performance on the ADATA XPG SX900 solid state drive measured average speeds of 488.2 MB/s, with a close maximum peak speed of 496.6 MB/s. Everest linear write-to tests were next...

The waveform chart above illustrates how well the ADATA XPG SX900 managed file transfers, making linear write performance appears very consistent. ADATA's XPG SX900 solid state drive recorded an average linear write-to speed of 471.0 MB/s, with maximum performance reaching 474.4 MB/s.

The chart below shows the average linear read and write bandwidth speeds for a cross-section of storage devices tested with EVEREST:

Linear tests are an important tool for comparing bandwidth speed between storage products - although HDD products suffer performance degradation over the span of their areal storage capacity. Linear bandwidth certainly benefits the Solid State Drive, since there's very little fluctuation in transfer speed. This is because Hard Disk Drive products decline in performance as the spindle reaches the inner-most sectors on the magnetic platter, away from the fast outer edge.

In the next section we use PCMark Vantage to test real-world performance...

PCMark Vantage HDD Tests

PCMark Vantage is an objective hardware performance benchmark tool for PCs running 32- and 64-bit versions of Microsoft Windows Vista or Windows 7. PCMark Vantage is well suited for benchmarking any type of Microsoft Windows Vista/7 PC: from multimedia home entertainment systems and laptops, to dedicated workstations and high-end gaming rigs. Benchmark Reviews has decided to use the HDD Test Suite to demonstrate simulated real-world storage drive performance in this article.

PCMark Vantage runs eight different storage benchmarks, each with a specific purpose. Once testing is complete, results are given a PCMark score while and detailed results indicate actual transaction speeds. The 256GB ADATA XPG SX900 SSD produced a total PCMark Vantage (secondary) HDD Test Suite score of 51265, with specific speeds reported below:

Our tests were conducted on an Intel P67-Express Sandy Bridge motherboard using the onboard native SATA 6Gb/s controller with 64-bit Windows 7. Performance results are displayed in the chart below:

In the next section, I share my review conclusion and final product rating.

ADATA XPG SX900 SSD Conclusion

IMPORTANT: Although the rating and final score mentioned in this conclusion are made to be as objective as possible, please be advised that every author perceives these factors differently at various points in time. While we each do our best to ensure that all aspects of the product are considered, there are often times unforeseen market conditions and manufacturer changes which occur after publication that could render our rating obsolete. Please do not base any purchase solely on our conclusion, as it represents our product rating specifically for the product tested which may differ from future versions. Benchmark Reviews begins our conclusion with a short summary for each of the areas that we rate.

LSI/SandForce SSDs have had a huge impact on high-performance storage, but consumer's have never appreciated the 'over-provisioning' technology that reduced their capacity. Thanks to new firmware developments, companies like ADATA can now offer products that compete gigabyte-for-gigabyte with the competition. Not only are these SandForce-driven solid state drives extremely fast, but more importantly they're capable of SLC-level operational performance I/O and NAND durability. The ADATA XPG SX900-series builds from the powerful SandForce SF-2281 solid state processor, which brings innovation to the SSD industry by prolonging MLC NAND flash module lifetime and delivering RAID-like data redundancy.

Our performance rating considers how effective the ADATA XPG SX900 solid state drive performs in operations against direct competitor storage solutions. For reference, SandForce specifies the SF-2281 controller capable of 500 MB/s maximum read/write speeds, which ADATA increases to 550/530 MB/s read/write for uncompressed data and 510/320 MB/s read/write for compressed data on this 256GB model. In our storage benchmark tests, the 256GB ADATA XPG SX900 Solid State Drive performed at or above this speed, and competed with the fastest products previously tested. Our test results proved the ADATA SX900 was good for delivering 558/532 MBps peak read/writes speeds using ATTO Disk Benchmark. Linear testing with Everest Disk Benchmark produced 488/471 MB/s, placing the ADATA SX900 in the top three for SATA SSD results.

The retail kit (ASX900S3-256GM-C) that ADATA sent us for testing advertises up to 90,000 maximum combined IOPS, although it is unclear what tools were used to produce this figure. Using a SandForce-provided configuration for our own Iometer operational performance tests, we used a queue depth of 32 outstanding I/O's per target that measured 79,820 combined IOPS performance. In this test, the ADATA XPG SX900 SSD performed well and positioned itself among the highest-I/O products. In the 4K 32QD tests with AS-SSD and CrystalDiskMark, the ADATA XPG SX900 SSD continued to match up to enthusiast storage solutions like the OCZ Vertex 3 Max IOPS Edition. Considering the entry-level pricing attached to ADATA's XPG SX900 series, it performed more like competing premium-level storage products.

Solid State Drives are low-visibility products: you see them just long enough to install and then they're forgotten. Like their Hard Disk Drive counterparts, Solid State Drives are meant to place function before fashion. Anything above and beyond a simple metal shell is already more than what's expected in terms of the appearance. ADATA has created a back-to-basics look with the anodized black textured finish on their XPG SX900-series SSDs. As solid state storage controllers become faster and more advanced, heat dissipation through the enclosure walls may demand that chassis designs become more beneficial than they previously needed to be. This isn't the case yet, and a metal chassis suits SandForce SSDs nicely.

Construction is probably the strongest feature credited to the entire SSD product segment, and ADATA believes their XPG SX900-series is no exception. The ADATA XPG SX900 SSD is covered by a three-year limited warranty. ADATA recommends that you register your product to receive warranty support. Unfortunately, there are no online discussion forums/chat or local telephone service numbers available for technical support.

With so many SandForce products being physically identical to each another, the overall value tends to focus on price, warranty, and customer support. If you're price shopping, a quick stroll through our Storage Section reviews will reveal how other SSD options compare. As of September 2012, the ADATA XPG SX900 SSD is available online in the following capacities and prices:

• 64GB ASX900S3-64GM-C: $69.99 (Newegg / Amazon)
• 128GB ASX900S3-128GM-C: $109.99 (Newegg / Amazon)
• 256GB ASX900S3-256GM-C: $199.99 (Newegg / Amazon)
• 512GB ASX900S3-512GM-C: $339.99 (Newegg / Amazon)

During benchmark testing I noted that the performance results matched those of ultra-premium SSDs, yet ADATA's XPG SX900 series is presently among the least expensive solid state drives available in each capacity. For an entry-level price, consumers are getting a full upgrade kit with 2nd-generation LSI/SandForce SF-2281 SSD that performs among the fastest SATA-based storage solutions. On top of performance, you're also getting back 7% of the storage capacity previously 'lost' to provisioning. Together, these three reasons give the ADATA XPG SX900-series a formidable lead ahead of competing SSDs that lack speed, capacity, and price. I highly recommend the ADATA XPG SX900 Solid State Drive, as it's earned our Golden Tachometer Award for excellence.

Pros:

+ Outstanding 558/532 MBps read/write speed with ATTO
+ Produced 80,000 combined 4K IOPS
+ Among the most affordable SSDs available
+ TCG OPAL security with 256-bit AES encryption
+ Uses synchronous NAND flash components
+ SandForce SF-2281 processor supports TRIM, SMART, and RAISE
+ DuraWrite technology extends NAND lifetime
+ Enthusiast-level operational I/O performance
+ 3-Year ADATA product warranty support
+ Available in 64/128/256/512GB storage capacities
+ Lightweight compact storage solution
+ Resistant to extreme shock impact
+ Low power consumption may extend battery life

Cons:

- Limited company support
- Expensive enthusiast-level product

Ratings:

• Performance: 9.75
• Appearance: 8.75
• Construction: 9.75
• Functionality: 9.50
• Value: 8.25

Final Score: 9.2 out of 10.

Excellence Achievement: Benchmark Reviews Golden Tachometer Award.

Benchmark Reviews invites you to leave constructive feedback below, or ask questions in our Discussion Forum.

Related Articles:

• Honeywell Altura MLX 42-inch 1080p 10-bit HDTV
• EonNAS 1100 NAS Network Storage Server
• Sapphire Radeon HD 4850 Video Card 100242L
• Antec MicroFusion Remote 350 Mini HTPC Enclosure
• Intel Sandy Bridge Overclocking Guide
• QNAP TS-659 Pro II NAS Network Server
• Aeneon PC3-10666 DDR3 1333MHz AXH760UD00-13G
• ATI Radeon HD 5970 Hemlock Video Card
• Belkin N1 Vision Wireless N Router F5D8232-4
• OCZ RevoDrive PCI-Express SandForce SSD