WD SN850 Slower than expected performance

[MasterOfManyMuffins]

After having stutter in all games from a prebuild machine i am going insane.
Below scores are after a clean windows install, all firmware (SSD, tomahawk motherboard, Chipset. etc)

I have to identical 2 terabyte WD 850 drives. But what is going on with my system drive.

Seems almost like its hitting some weird cap. all MB write speed below hover around 128mb pr second, compared to what i would expect on the right. Does anyone here have any idea why this could be?

Edit: Ok. I dont know if this fixes anything. But i the performance test issues, were fixed by realigning my SSD. You can see in the first picture that the allignment supposedly is off.

I have 0 clue what or why, but apparently that can cause slow ssd performance. And after doing the reallignment on the drive, it now performs as expected from the second disc.

 

[Deluxe1]

After having stutter in all games from a prebuild machine i am going insane.
Below scores are after a clean windows install, all firmware (SSD, tomahawk motherboard, Chipset. etc)

I have to identical 2 terabyte WD 850 drives. But what is going on with my system drive.

Seems almost like its hitting some weird cap. all MB write speed below hover around 128mb pr second, compared to what i would expect on the right. Does anyone here have any idea why this could be?
View attachment 228352

Edit: Ok. I dont know if this fixes anything. But i the performance test issues, were fixed by realigning my SSD. You can see in the first picture that the allignment supposedly is off.

I have 0 clue what or why, but apparently that can cause slow ssd performance. And after doing the reallignment on the drive, it now performs as expected from the second disc.

Are you using win11?

Windows 11 Users are Reporting Strange NVME SSD Behavior (Updated)

Users across various forms are reporting mysteriously sluggish benchmark results for SSDs in Windows 11.

www.extremetech.com

 

[an00bis]

I get these numbers with an SN850 500GB as boot drive in M.2_1 on an MSI B550 A-Pro / 5800X. WD Dashboard confirms capability as Gen4, but connection as Gen3. Fresh Windows 10 installation, most recent firmware, most recent BIOS with AGESA 1.2.0.5, most recent chipset drivers, SSD as GPT. Any idea?

 

[Deleted member 24505]

I'll be grabbing a 1TB SN850 in morning. Can't wait to test it in the z690 board.

 

[Athlonite]

I get these numbers with an SN850 500GB as boot drive in M.2_1 on an MSI B550 A-Pro / 5800X. WD Dashboard confirms capability as Gen4, but connection as Gen3. Fresh Windows 10 installation, most recent firmware, most recent BIOS with AGESA 1.2.0.5, most recent chipset drivers, SSD as GPT. Any idea?

View attachment 230202
View attachment 230204

from your mobo manual

Storage 1 x M.2 Gen4 x4, 1 x M.2 Gen3 x4 slot

 

[Deleted member 24505]

Here are my SN850 speeds

 

[chrcoluk]

Pretty funny thread, people jumping on and blaming asrock, defending WD as if their life depended on it, attacking the OP for saying its a WD drive issue.

What was it in the end? It was down to the way the drive was designed to operate fixed by a firmware update.

Glad it got solved, seems mainly due to pushing from the German community.

Hopefully lessons also learned for reviewers, dont rush the reviews, test in cpu and chipset lanes.

 

[eddy23]

Check that your partitions on the drive have the correct 4k alignment. You can check in the dashboard, Tools - Advanced Information - Device Details - 4k Alignment. Also, check that you've not modified the Write-Cache Settings. Enable Windows write caching should be ON, Disable Windows write-cache buffer flushing should be OFF.

Hello, I just wanted to say that I had this exact same problem, I followed your recommendations and my problem was 4K Alignment, in the end I formatted my SSD (SN850x 4TB), I used WD formatting tool and now write speed is working like a charm, thank you for your help.