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Plextor M8V 512GB SATA III SSD Review (Page 7)

By Jon Coulter from Feb 13, 2018 @ 10:00 CST
TweakTown Rating: 94%Manufacturer: Plextor

Iometer - Maximum IOPS

Version and / or Patch Used: Iometer 2014

We use Iometer to measure high queue depth performance. (No Partition)

Max IOPS Read

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Max IOPS Write

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At QD32, we are exceeding factory max random specs by a significant amount.

Iometer - Disk Response

Version and / or Patch Used: Iometer 2014

We use Iometer to measure disk response times. Disk response times are measured at an industry accepted standard of 4K QD1 for both write and read. Each test runs twice for 30 seconds consecutively, with a 5-second ramp-up before each test. We partition the drive/array as a secondary device for this testing.

Avg. Write Response

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Avg. Read Response

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This testing bypasses any SLC buffer that may be on the drive when reading data which is why the M8V is delivering much lower random read performance at QD1 than we've seen from our other testing. Write response looks good, read response is average.

DiskBench - Directory Copy

Version and / or Patch Used: 2.6.2.0

We use DiskBench to time a 28.6GB block (9,882 files in 1,247 folders) composed primarily of incompressible sequential and random data as it's transferred from our DC P3700 PCIe NVME SSD to our test drive. We then read from a 6GB zip file that's part of our 28.6GB data block to determine the test drive's read transfer rate. Our system is restarted prior to the read test to clear any cached data, ensuring an accurate test result.

Write Transfer Rate

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Read Transfer Rate

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When testing write transfer rates we have a rule of thumb. If any SSD cannot achieve 200MB/s with our write transfer test, that SSD will not receive a TweakTown recommendation. There are many TLC SSDs that do not pass our minimum, but we didn't include those on our chart. Additionally, we recently updated to Windows 10 Anniversary Edition and with that update, sustained write performance greatly increased. This means our previous transfer tests cannot be compared with those run on the newer version on Windows 10. This is the reason we have drive's that differ from the rest of the review on this chart.

This test exposes the downside of lower performing TSOP packaged flash when writing a large block of data. The M8V reads data very fast but underperforms a bit when writing a large chunk of data. The M8V is the only SSD in our test pool that is using TSOP packaged flash. The good news is most users rarely write large blocks of data at one time. As we see it, this is a fair trade-off for the M8V's low price point.

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