Samsung SM951-NVMe (256GB) PCIe SSD Review
by Kristian Vättö on June 25, 2015 9:40 AM ESTMixed Random Read/Write Performance
For full details of how we conduct our Iometer tests, please refer to this article.
In mixed performance the SM951 NVMe presents a good boost to performance over the AHCI version, although it still can't even get close to the SSD 750. This is generally an area where I would like to see improvement from Samsung and basically every SSD OEM.
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Mixed Sequential Read/Write Performance
Unfortunately the good mixed random performance doesn't translate to mixed sequential performance. The SM951 NVMe takes a quite considerable hit compared to the AHCI version, although it still offers better performance than any of the SATA 6Gbps drives on the market.
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The reason lies in the fact that performance only drops as the share of writes is increased. I suspect there might be some throttling going on, or if not then the firmware isn't properly optimized because other Samsung drives have a nice "bathtub" curve.
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patrickjp93 - Thursday, June 25, 2015 - link
They aren't all storage transfer commands go through the PCH. Your PCIe SSDs do not connect to the CPU directly in most cases. Some enterprise grade drives do, but most consumer do not.Kristian Vättö - Friday, June 26, 2015 - link
PCIe is PCIe regardless of whether the controller is inside the CPU or PCH. PCH merely acts as a hub for different interfaces, but ultimately it connects to the CPU as well since that is where all the processing is done.CajunArson - Thursday, June 25, 2015 - link
Yeah so are we missing some sound and FURY [hint hint] about this SSD on a stick?Kristian Vättö - Thursday, June 25, 2015 - link
Fury X is coming, Ryan just needed one more day because the flu has been undermining his ability to work.DigitalFreak - Thursday, June 25, 2015 - link
(hint hint) The 980ti is faster than the Fury X all around.CajunArson - Thursday, June 25, 2015 - link
I'm not disagreeing with that statement.I just want the review.
lilmoe - Thursday, June 25, 2015 - link
+1A DX12 showdown between FuryX and 980ti would be highly welcome as well.
Gigaplex - Thursday, June 25, 2015 - link
The Fury X wins in some of the 4k tests. The 980Ti seems faster overall, but it's not "all around".mr_tawan - Friday, June 26, 2015 - link
From what I've read, it looks like the Fury has advantages when it comes to memory-intensive use case.SofS - Thursday, June 25, 2015 - link
About the driver issue, how do different operating systems fare? Like 32/64 bits, XP/7/8/10 and Linux old/new (for instance CentOS/Fedora).