The test system used in this review was an HP 8200 Elite. The computer came equipped with an Intel Core i5-2400 CPU, 4GB of DDR3 1333MHz memory, Seagate Barracuda 7200.12 ST3250312AS 250GB SATA 6 Gb/s hard drive, NVIDIA Quadro FX580 512MB PCIe graphics card and an Intel 82579-LM gigabit network card. For the operating system, I installed a fresh copy of Windows 7 Enterprise. I should also point out that our test system is not equipped with an mSATA port so we had to use an mSATA to SATA 6 Gb/s adapter card.

To test the performance of the Plextor PX-256M5Pro Xtreme, I ran a series of benchmarks using CrystalDiskMark 3.0.1, HD Tach RW, ATTO Disk Benchmark 2.46, AS SSD, HD Tune Pro 4.61, Anvil's Storage Utilities and Iometer. For comparison, I've also included test results from the Plextor PX-256M5M, Samsung SSD 840 EVO mSATA, OCZ Vector 150, OCZ Vertex 450, Silicon Power Slim S55, Samsung SSD 840 EVO, Seagate 600 SSD, SanDisk Extreme II, OCZ Vector, Plextor PX-256M5Pro Xtreme, Samsung SSD 840 Pro, Samsung SSD 840, Kingston Ultra Plus, OCZ Vertex 4, OCZ Agility 4 and Kingston HyperX 3K.

Like the M6S, the M5M is based on Marvel's 88SS9188 controller chip. Looking at the screenshot above, you can see that it performs equally well with both incompressible (0%) and compressible (100%) data.

CrystalDiskMark 3.0.1:

First, I ran a few quick tests using CrystalDiskMark. This benchmark tool measures the performance of a storage device by testing its sequential read and write speeds as well as its random read and write speeds using blocks 512K and 4K in size.

Plextor PX-256M6M

Plextor PX-256M5M

According to Plextor, the PX-256M6M is capable of reading at 520 MB/s and writing at 440 MB/s when connected to a SATA 6 Gb/s port. While the drive performed well, it came up a bit short of these numbers in CrystalDiskMark's sequential read and write speed tests.

Plextor PX-256M6M - All 0x00, 0Fill

Plextor PX-256M5M - All 0x00, 0Fill

The PX-256M6M performed equally well when using highly compressible 0x00 (0 Fill) data. This time around, the drive was able to read at 498.7 MB/s and write at 432.6 MB/s.

HD Tach RW

Next, I used HD Tach to test the PX-256M6M's read, write and burst speeds as well as its seek times and CPU usage.

Looking at the screenshot above, you can see that the PX-256M6M had average read and write speeds of 418.8 MB/s and 360.9 MB/s respectively, as well as a burst speed of 364.6 MB/s.

ATTO Disk Benchmark 2.46:

I also used ATTO Disk Benchmark to test the PX-256M6M's sequential read and write speeds. The tests are run using blocks ranging in size from 0.5KB to 8192KB and the total length set to 256MB.

Plextor PX-256M6M

Plextor PX-256M5M

When tested with ATTO, the PX-256M6M's read speeds topped out at about 521 MB/s and its write speeds at 443 MB/s.