NVMHCI Interface For SSDs

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Scrotus

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Just read an article with reference to the AHCI interface vs NVMHCI for SSDs. The article did not detail how to use NVMHCI and I'm curious as to how to set it up. My Windows 10 Pro is installed on a Samsung 950 Pro M.2 drive along with some apps. I have a couple other SSDs with some stuff on them and one mechanical drive with backups stored on it. How to you use the NVMHCI?

I'm using an ASUS Maximus VIII Hero motherboard and the UEFI only offers AHCI as an option.
 
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The 950 Pro is an NVMe drive. If Windows is installed and working there is nothing more to set up. I didn't even remember ever seeing NVMHCI written out like that before and google just returns a few articles from 2008 that are obviously not relevant anymore.

I have a very similar setup. Windows 10 on a 512GB 950 Pro, a 500GB 840 Evo and an older 640GB WD Black HDD that I intend to replace with a 1TB SSD at some point in the near future.

The SATA drives still use the SATA bus. The 950 Pro uses PCI-E lanes. That's where the extra bandwidth of the NVMe interface comes from.

 
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Scrotus

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Hello Evolve. It's the first time I've seen reference to NVMHCI and it made me wonder if I was missing a setting somewhere. The motherboard has an M.2 Socket 3 connection but the UEFI only has an option to select the AHCI interface. Everything is operating without issues but as usual for an enthusiast I'm always looking for a bit of extra performance.
 
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Run the benchmarking tool in the Samsung Magician software and or use a program like AS-SSD.

http://www.techspot.com/downloads/6014-as-ssd-benchmark.html

That will show if your drives are performing as well as they are capable. I suspect they are since everything works.

Here are my 950 Pro and 840 Evo for comparison. There are many variables that can influence a benchmark so your results will vary but the 950 Pro results should be similar.

n4dq2t.jpg


Oh and the 840 Evo is obviously a SATA drive. Even the fastest SATA drives top out around 550Mb/s read and write as that's about all the SATA bus can handle. Hence the need for drives like the 950 Pro and new protocols like NVMe. :)
 
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Ran the AS-SSD benchmarks and there is a considerable difference in our performance results. For example your seq write 1441.53 MS/s vs my 36.68 and overall write score 673 vs my 60. Same drive as yours so I wonder what is causing the differences.
as%20ssd%20eval_zpsxihrg2fj.jpg
[/URL][/img]

 
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