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Samsung XP941 128GB PCIe SSD Review

By: Chris Ramseyer | m.2 SSDs in Storage | Posted: Aug 18, 2014 2:15 pm
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TweakTown Rating: 86%Manufacturer: RamCity

Futuremark PCMark 8 Extended - Consistency Test

 

Version and / or Patch Used: 2.0.228

 

Heavy Usage Model:

 

FutureMark's PCMark 8 allows us to wear the test drive down to a reasonable consumer steady state and then watch the drive recover on its own through garbage collection. To do that, the drive gets pushed down to steady state with random writes and then idle time between a number of tests allows the drive to recover.

 

Precondition Phase:

1. Write to the drive sequentially through up to the reported capacity with random data.

2. Write the drive through a second time (to take care of overprovisioning).

 

Degradation Phase:

1. Run writes of random size between 8*512 and 2048*512 bytes on random offsets for 10 minutes.

2. Run performance test (one pass only).

3. Repeat 1 and 2 for 8 times, and on each pass increase the duration of random writes by 5 minutes.

 

Steady state Phase:

1. Run writes of random size between 8*512 and 2048*512 bytes on random offsets for 50 minutes.

2. Run performance test (one pass only).

3. Repeat 1 and 2 for 5 times.

 

Recovery Phase:

1. Idle for 5 minutes.

2. Run performance test (one pass only).

3. Repeat 1 and 2 for 5 times.

 

Storage Bandwidth

 

PCMark 8's Consistency test provides a ton of data output that we use to judge a drive's performance. Here we see the three states of performance for the select SSDs, light use, consumer steady state and worst case.

 

samsung_xp941_128gb_pcie_ssd_review_65

 

Working in dirty states is just a fact of life when using with prosumer applications. Most of us use the SSD for the workload and then offload the results to another drive once finished. That means we work the drives hard, then offload the data and then work the drives hard again. When you cut and paste the large file, in my case large video files, to another drive, TRIM kicks in, but the drive still needs time to recover the dirty blocks. Sometimes it all happens so fast that recovery takes longer than the new work hits the flash.

 

In a very dirty state, the XP941 128GB is around 100 MB/s slower than the other two capacity sizes, but once recovered the performance goes up considerably.

 

Storage Bandwidth All Tests

 

samsung_xp941_128gb_pcie_ssd_review_66

 

Here we see all of the performance states though this long test. The two large capacity XP941 drives are at the top of the chart and the XP941 128GB is just below, third fastest on the chart full of all PCIe SSDs.

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