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Samsung SM951 NVMe M.2 PCIe 256GB SSD Review

By: Jon Coulter | PCIe in Storage | Posted: Jun 10, 2015 2:09 pm
TweakTown Rating: 96%Manufacturer: Samsung

Iometer - Maximum IOPS

 

Version and / or Patch Used: Iometer 2014

 

We use Iometer to measure high queue depth performance.

 

Max IOPS Read

 

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Max IOPS Write

 

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We normally test MAX IOPS with the test subject secure erased and no partition (FOB), but we did not secure erase the SM951 NVMe for any of our testing and decided to leave a partition on the drive for this test. This is the reason we were not able to hit Samsung's specification of 300/100K.

 

 

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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Write response times are good but not array good, or Intel 750 Series good. Read response times are again another lab record.

 

 

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 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 drives 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

 

samsung-sm951-nvme-256gb-ssd-review_37

 

Read Transfer Rate

 

samsung-sm951-nvme-256gb-ssd-review_38

 

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We expected the Intel drives to have the fastest read transfer rate, but the SM951 AHCI drive sets a new lab record. We tested several times to confirm this.

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