Super slow NVMe speeds?

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Valnar

Supreme [H]ardness
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Apr 3, 2001
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I bought a Plextor M8Pe(G) 1TB NVMe drive and a new ASUS Q270 motherboard to support it. I run Windows 7 and also Windows 10 - dual boot.

I have never owned an NVMe drive or motherboard before that supported it, so both are new. I cannot compare with anything else.

So the problem is my NVMe is slow. Like really slow. Way slower than the specs and my SATA SSD's. I've checked everything in my BIOS and all looks good. I am using it without UEFI mode so I can support other OS's on the same PC (different SATA drives - I'm not booting this NVMe drive). I'm not sure if that matters since the OS does see it.

Here is the CrystalDIskMark score. 'Note that it feels slower too, so it's not just a benchmark thing. Any ideas??

CDM-NVMe.jpg
 
Yeah, I know. What gives? This drive gets great reviews with much higher numbers than that.

Anything special I need to do to force it into turbo mode?
 
I have a feeling it's the motherboard and not the drive. Are you on the latest BIOS? What's the rest of your specs?
 
I have another slot I could try on it. I'll open it up and move it. Both are brand new.

I have a couple SATA SSD's, one HDD, ASUS audio card, Intel i5-6600, 8GB RAM
 
Nope, not that slot either. Going to buy another NVMe drive. This sucks. If it happens again, I get the fun of returning a motherboard.
 
The board supports pci-e nvme drives and the drive does use pci-e, so it shouldnt be an issue. Perhaps something is using the DMI bus interface quite a bit and causing a severe bottleneck? The one drive alone will saturate the DMI link from CPU to chipset so anything else using bandwidth will cause problems. I wouldn't expect it to be this bad, but perhaps something is just taking a lot of bandwidth
 
The only thing I have in any PCIe slot is an ASUS sound card. I temporarily removed it and no change.
 
I bought a Samsung 960 Pro M.2. Much better. Turns out it was a defective SSD after all. I've never seen that before.

2019-04-19 17_55_43-CrystalDiskMark 5.5.0 x64.jpg
 
I used 6.0 as well, but I like 5.50. I'm glad it wasn't the new motherboard. 'Easier to RMA the Plextor NVMe.
 
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