Why is one of my NVME SSD's very slow with writes.

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simonpuk

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May 27, 2020
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My system is an i9 on a z390 board with 64Gb of DDR4 Ram and a 3080.

The two onboard M.2 slots are taken up with two NVME SSD's - A 2tb Seagate Firecuda 510 and a WD 2Tb.

There are also 2 spinners in there for backup.

The Seagate Firecuda is the C drive (booting Windows 10).
The WD NVME is a storage drive (Drive E).

If I run CrystalDiskMark 8 I get great read and write speeds (as expected) on the WD E Drive but terrible write speeds on the Firecuda C drive.

Trim is on.

They are both connected as Gen 3.

Both have enough space.

AHCI is enabled and running.

I just can't figure it out.

Here is the CDM for the E drive (pretty much what I would expect) :

https://www.screencast.com/t/zk9GPHdxYgk1

Here is the CDM for the C drive (with terrible write speeds) :

https://www.screencast.com/t/CuFAmJCkf8O

Here is the Info for the E drive :

https://www.screencast.com/t/HoZmUTuv

Here is the Info for the C drive :

https://www.screencast.com/t/jfxgHgJmy

Trim definately enabled :

https://www.screencast.com/t/SKertzIlHjA

If anyone can suggest anything I would be most grateful
 
It's your OS drive, you have other things running in the background in contention for disk usage. Try booting from a USB stick WinPE or Linux distro and run a benchmark again and see if the issue resolves.
 
mwroobel said:
It's your OS drive, you have other things running in the background in contention for disk usage. Try booting from a USB stick WinPE or Linux distro and run a benchmark again and see if the issue resolves.
Click to expand...

Well sure but surely not that much performance with just Win 10 running and no foreground apps ? I mean the config is very similar to my other workstation and I get amazing write speeds on my OS drive.
 
simonpuk said:
Well sure but surely not that much performance with just Win 10 running and no foreground apps ? I mean the config is very similar to my other workstation and I get amazing write speeds on my OS drive.
Click to expand...
Which is why I suggested booting from a LiveUSB/WinPE to remove the OS contention issue from the equation. If it continues to suck then you can investigate other avenues. You would be surprised how much shit is running in the background fighting for the same access to the drive as your benchmark software.
 
One thing that has just struck me - I can't remember what my previous CDM scores were in the past but I have recently changed from a 2080ti GPU to a 3080 - Could that be the issue ?
 
It's an Asus ROG STRIX Z390-F GAMING - one other thing I noticed today was that the Firecuda is in the number 2 slot and WD is in the number 1 slot.
 
So out of your two M.2 NVME slots, one is provided by the CPU and one is provided by the chipset. That could be just how the chipset one works. Try swapping slots to see if the write speed is limited to rule out if it's the drive or slot.

You could also try changing your write caching setting to see if that makes any differenec.
 
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