Desktop PC – Synthetic Benchmarks
As its name suggests AS SSD was developed specifically to measure the performance of SSDs. It measures Sequential Read and Write performance with an IO Size of 16MB and a Queue Depth of 1. It measures Random 4K Read and Write for a Queue Depth of 1 and for 64 Threads. 64 Threads generates a Queue Depth of 64 (please note that SATA drives support a maximum Queue Depth of 32, so they are at a disadvantage in this test to NVMe devices, which support queue depths of 128 or more). The Access Time AS SSD reports is for 512Byte sequential reads and writes.
The 4K random Reads and Writes performance is particularly relevant to a drive’s ability to act as a Windows system drive. I use the default test file size of 1GB.
AS SSD produces a score for Read Performance, Write Performance and an Overall Score.
The scores are calculated as –
Overall score = (Seq Write x 0.15) + (Seq Read x 0.1) + (4K Read * 2) + 4K Write + 4K-64Thrd Write + (4K-64Thrd Read * 1.5)
Read score = (Seq Read * 0.1) + 4K Read + 4K-64Thrd Read
Write score = (Seq Write *0.1) + 4K Write + 4K-64Thrd Write
For Client SSDs, I feel that there should be an even greater loading given to the Queue Depth 1 4K Read and 4K Write results but nevertheless AS SSD is a quick and useful benchmark. I always use a 1GB test file. We would expect a modern SATA SSD to achieve an overall score of 1000+.
The latest version of AS SSD can be downloaded here.
Here is the AS SSD result for the Samsung 970 EVO –
This is an outstanding result.
I must now admit that I have a growing problem with the efficacy of AS SSD when used to test the latest high performance NVMe drives. Let me explain.
Here’s another AS SSD run against the 970 EVO –
You can see that this result shows an obvious and massive over statement in the 4K-64Thrd Write result and this sort of result is happening regularly on my rig (even with the latest Version 2 of AS SSD).
Here’s another example, which is run against my Intel Optane 900P system drive (and this sort of result appears every time on my rig) –
On this occasion there is an obvious, massive, and impossible over statement in the 4K-64Thrd Read result.
So it appears that AS SSD has problems with the 64KThrd testing. Perhaps, these sorts of results are unique to my rig, but I very much doubt it (the rig is a typical Z170 platform running Windows 10). So, I advise readers to be wary of AS SSD results until this problem with AS SSD is sorted out.
Here is a comparison of the overall AS SSD score with the other products I have tested –
Anvil’s Storage Utilities
Anvil’s Storage Utilities tests Sequential Reads and Writes with an IO Size of 4MB, Random 4K Reads and Writes at Queue Depths of 1, 4 and 16 and Random 32K and 128K Writes.
The scores are calculated as –
Overall Score = Read Score + Write Score
Read Score = (Seq 4MB = MB/s x 1) + (4K = MB/s x 4.5) + (4K QD4 = MB/s x 2.75) + (4K QD16 = MB/s x 1.75) + (32K = MB/s x 1) + (128K = MB/s x 1.5)
Write Score = (Seq 4MB = MB/s x 1) + (4K = MB/s x 4) + (4K QD4 = MB/s x 3) + (4K QD16 = MB/s x 3)
I always use a Test size of 1GB and 100% Incompressible data.
The latest version of Anvil’s Storage Utilities can be downloaded here.
Here is the Anvil result for the Samsung 970 EVO –
Here is a comparison of the Anvil Total score with the other products I have tested –
An outstanding result.
Crystal Disk Mark
Crystal Disk Mark is a widely respected benchmark, which is often used by manufacturers as a basis for publishing their ‘headline’ sequential read and write speeds. I always run the test with One Thread and a Queue Depth of 32 (which generates a Queue Depth of 32, being the maximum Queue Depth supported by SATA drives), a 1GB test file, Random data and 3 or 5 passes. The benchmark performs sequential IO with an IO Size of 512K for the Seq Q32T1 test, sequential IO with an IO Size of 1MB for the Queue Depth 1 Seq test and Random IO with an IO Size of 4K for the 4K (Queue Depth 1) and the 4K Q32T1 test.
Crystal Disk Mark can be downloaded here (I use the standard edition).
Here is the CDM result for the Samsung 970 EVO –
You can see that the headline Sequential Read speed, as specified by Samsung, of 3500MB/s, has been exceeded in this test, whilst the headline sequential write speed of 2500 MB/s has just not.
The ATTO benchmark tests Sequential IO for a large range of IO Sizes. I always run the test with the default Queue Depth of 4.
ATTO can be downloaded here.
Here is the ATTO result for the Samsung 970 EVO –
You can see that the maximum Sequential Read and Write speeds (of 3500 MB/s and 2,500 MB/s respectively), as specified by Samsung, have not been achieved.
Now let’s head to the next page, to look at the results for the Desktop PC Real World Benchmarks…..