I have a Toshiba XG5 256GB. Just wanted to give heads up that the with the standard NVMe driver, the speeds (acc. to CrystalDiskMark) are around 2.800 read/500-750 write (read is ok but write is quite below the advertised speeds of 1.100 +/-).

However, with the modified Toshiba/OCZ drivers (both RD400 and XG5), the write speeds do not exceed 350 MB/s.
I've spent the better part of 2 days fiddling with BIOS settings, drivers etc., to no avail

System is Asus Maximus IX Hero + 7700K @ 4.2 GHz, 16 GB RAM, Toshiba XG5 NVMe, 2xLiteOn 128GB SATA SSDs, 2 HDDs. Running on Windows 10 1803 with latest updates, installed on the XG5. CPU C States are off.
If anyone has any idea how to improve the write performance, regardless with which driver, it will be appreciated.

Regards,

Edit: Aaaaand now the speed drops to 350 MB/s even with the Standard NVMe drivers. It's driving me mad.

Zitat von Fernando im Beitrag #1203

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Have you already read the start post of >this< thread and did you follow the related advices (e.g. point 8)?

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@omegaRED
I have a similar 'no understandable problem' on a PC portable MSI running W10 bootable from a Samsung PM981 NVME M.2 device (512GB).
A contrario to your case, I do observe a severe performance READ performance issue which is about only 1/3 of the official Samsung specification.
However, WRITE performance does seem acceptable.
If you look at this bench results you should observe the 'abnormal' results.
I have triple checked using different Tool tests and different options such as Spectre/No Spectre protection, 3 fans normal/full speed, NVMe driver driver/manufacturer, etc..
The abnomaly does persist.
I see no logical reason to observe a so low performance READ issue compared to 'normal' performance WRITE.
If abnormal temperature was the source of the problem, READ and WRITE should be impacted as well ! It is not the case.
Is there somewhere a firmware erratic issue which does detect premature potential temperature and does abruptly activate a performance limitation for Read only operations ?




For information I get this for a 960PRO 1TB NVMe SSD device, READ and WRITE performances are present as expected whatever are the circonstances:

Zitat von Fernando im Beitrag #1205

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Maybe your Toshiba NVMe SSD has been stressed too heavily. Did you check the temperature?
What about overclocking?

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@100PIER

I had the same exact performance issue with read speeds being a third of normal on the lower third of the end of Atto bench scores on a Samsung 950 Pro some months back. If I remember correctly this was in my case from Open Fabrics ver 1.5 open source driver I was using. I would recommend you clean out your driver stores and reinstall a different version. I was able to fix it by removing the OF driver. I think ver 1.6 of OF may be out and worth further tests.

@davidm71
Thanks for sharing your experience.
The tested MSI portable PC GS63 Stealth 8RE (Intel i7-8750H) is very recent and offered with W10 x64 RS1 pre-installed on PM981. I have updated W10 to RS4 version and then applied all Windows updates.
So, at my knowledge any Open Fabrics NVMe OF driver has never been preinstalled on this PC. But, I have to check it carefully that.
I think more on a firmware issue.
The suggested test to do from MSI Tech Support is to switch the default BIOS SATA mode from 'AHCI' to 'Intel RST Optane' mode.
For me this it does seem very strange because AHCI mode is not relevant for a NVMe device.

@100PIER Well from my experience this is a driver issue though it could be anything. I would try booting off of a Windows2Go USB stick and take new benchmark readings to rule out your OS is not at fault. Keep us updated. Curious how this works out for you. Good luck.

@davidm71
It does seem Win2Go is for W8.x users only. I do use W10 x64 only.

@100PIER,

Actually there are ways to create a Windows 10 Win2go stick. Point is if only you had a fresh install to benchmark the drive.

@davidm71
Theorically some tools such as Rufus, WintoUSB, AOMEI PA, WinToBasic should be able to create a W10 Win2go stick.
But I have W10 Home version and I assume W10 Enterprise only does authorize to create a W10 Win2go stick ?

@100PIER,

There are a number of tools out there that make a Win 10 Win2go stick. Not sure about Win10 Home. You could always download a Win 10 Pro or Enterprise install image and pull the important files needed from the ISO by decompressing the installation files. Last time thats how I did though honestly can not remember how. In my opinion it would be an important tool to have so you can get clean benchmark scores. I think I may make one right now as I have a high speed usb stick sitting in the draw. Last time I did it it was on a slow usb 3 stick and very slow. So make sure your usb stick is fast.