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ADATA XPG SX950 480GB SATA III SSD Review

By: Jon Coulter | SSDs in Storage | Posted: Oct 23, 2017 7:23 pm
TweakTown Rating: 94%Manufacturer: ADATA

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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We are getting 9K more random read IOPS than the factory spec of 90K IOPS at QD32. However, we are 7K short of the 90K random write factory spec. We really have to wonder, where did this spec come from?

 

 

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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Only two drives in our test pool deliver better write response that the XPG SX950. The reverse is true of read response. Only two drives in our test pool deliver worse read response than the XPG SX950.

 

 

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 only have a few drives on our chart.

 

Interestingly enough, read transfers are the second best of the drives in our test pool. Write transfers are also excellent – well over 500MB/s.

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