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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

70/30 Mixed Workload Test (Sledgehammer)

 

Version and / or Patch Used: Iometer 2014

 

Heavy Workload Model

 

This test hammers a drive so hard we've dubbed it "Sledgehammer." Our 70/30 Mixed Workload test is designed to simulate a heavy-duty enthusiast/workstation steady-state environment. We feel that a mix of 70% read/30% write, full random 4K transfers best represents this type of user environment. Our test allows us to see the drive enter into and reach a steady state as the test progresses.

 

Phase one of the test preconditions the drive for 1 hour with 128K sequential writes at QD32. Phase two of the test runs a 70% read/30% write at QD32, full random 4K transfer workload on the drive for 1 hour. We log and chart (phase two) IOPS data at 5-second intervals for 1 hour (720 data points). 60 data points = 5 minutes.

 

adata-xpg-sx950-480gb-sata-iii-ssd-review_46

 

What we like about this test is that it reflects reality. Everything lines up, as it should. Consumer drives don't outperform Enterprise-Class SSDs that were designed for enterprise workloads. Consumer drives based on old technology are not outperforming modern Performance-Class SSDs, etc.

 

OP and capacity have a lot to do with the results of this test. This is actually very impressive. At an average of 29K IOPS, the XPG SX950 is second only to the Neutron XTi. This result tells us that the XPG SX950 can handle the heaviest of workloads with relative ease. This performance is as good as we see from many NVMe SSDs.

 

 

 

Sustained Sequential Write

 

Version and / or Patch Used: Iometer 2014

 

Heavy Workload Model

 

We write to the drive for 1 hour with 128K sequential writes at QD32. We log and chart megabytes per second data at 5-second intervals for 1 hour (720 data points). 60 data points = 5 minutes.

 

adata-xpg-sx950-480gb-sata-iii-ssd-review_47

 

Here we can see the unmasked sequential write performance of the SX950, and it doesn't look very good. We suspect that the SX950 doesn't utilize direct-to-die write technology, and it is continuously filling and flushing the SLC cache, causing erratic and unexpectedly low sustained sequential write performance. However, we will take this result with a grain of salt, because the SX950 did exceptionally well with our transfer testing.

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