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SanDisk X400 1TB SATA III SSD Review

By: Jon Coulter | SSDs in Storage | Posted: May 26, 2016 5:50 pm
TweakTown Rating: 93%Manufacturer: SanDisk

Iometer – Maximum IOPS


Version and / or Patch Used: Iometer 2014


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


Max IOPS Read




Max IOPS Write







With our configuration, we are able to exceed SanDisk's 95K maximum read IOPS specification. We are not able to achieve SanDisk's 75K maximum write IOPS specification, falling short by roughly 10K IOPS. We are not sure how SanDisk arrived at their 75K 4K random write specification. However, we are very certain that they did not run their test for a full 30 seconds, which apparently exceeds the drive's nCache 2.0 capacity.



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




Avg. Read Response






With a read response of well under 0.1ms or 42MB/s (10K IOPS) at 4K QD1, the X400 smashes the competing drives in our test pool. The X400 gets edged out of first by the SP550 in write response.



DiskBench - Directory Copy


Version and / or Patch Used:


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




Read Transfer Rate






The main drawback to planar-based TLC SSDs is sustained write performance. We see it getting better as time goes on. The X400 is able to best the competing SSDs in our test pool by a significant margin. Marvell's 88SS1074 and 15nm SanDisk TLC flash is proving to be a potent combination.

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