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WD SN850 4K read/writes much slower in Windows 11

blasteris

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Hi,
recently bought WB SN850 2 TB SSD and decided to run a few benchmarks to see how it matches against reviewed ones. I expected a few percent difference, but some tests differ more than twice. I thought maybe my settings were wrong, or I didn't enable something in the bios, but after tinkering for a few hours I thought that I got a bad SSD and was about to return it, but decided to create a new partition and install Windows 10. And on Windows 10 all tests are as good as reviewers got (just AS SSD benchmark shows higher acc. time). Did same tests with Samsung 970 EVO 500 GB (my boot drive for Windows 11), and it seems that mostly write speeds are slower on Windows 10.
SN850 is in the top motherboard slot, running at Gen.4 x 4 and reaching max temp 63 C during testing.
After reading some threads, it seems that people only have write speed problems with Windows 11. Did anyone else encounter such an issue? Is it WD SN850 problem or just some compatibility issue?
Got latest bios, chipset drivers... don't know if other drivers matter?
My specs:
CPU: Ryzen 5900x
MB: Asus B550-E
GPU: RTX 3070
RAM: G.Skill 32 GB
SSD1: WD SN850 2TB
SSD2: Samsung 970 EVO 500 GB
HHD1: Seagate 8 TB
HHD2: Seagate 3 TB



 
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Old news... because it uses stock windows nvme driver.. It has less IRQ's and priority assigned to it.
 
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So there's nothing to be done? Go back to Windows 10 or wait for new driver?

Why haven't you put their real drivers, for each drive, Samsung and WD have their own NVME drivers with some specific fixes too.
 

blasteris

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Why haven't you put their real drivers, for each drive, Samsung and WD have their own NVME drivers with some specific fixes too.
Samsung driver didn't help, and it seems I can't find WD drivers. Have WD dashboard installed, but no dedicated drivers. Maybe I just don't know where to look.
 
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In same manner update AMD drivers and adjust power plan PCIe settings.

Other than that I do not exhibit any performance degradation on my Samsung drive on Win11. Keep in mind those benchmarks are very single thread, high CPU clock dependent.
 
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I have Windows 11 Pro and a WD SN850 1TB on a B560 Intel platform. I think I am having similar issues, but strangely they are partition-dependent. If I create a new empty partition at the end of the drive, performance (in particular peak write performance) seems about right, but if I test it on C:, I get only about 300k IOPS peak for writes instead of about 700k.

Other performance figures are also apparently affected (and testing with a new partition appears to bring the full performance back), but random peak write performance is the simplest to test (e.g. with CrystalDiskMark).


EDIT: here is a test showing the difference between the C: and D: partitions. Similar differences also occur with larger testfiles; I chose 256 MiB just make the test less wasteful. Sometimes the D: partition too starts behaving oddly (slightly slower performance, also with reads, but this can be mainly observed with different tests), and creating a new one after shrinking it shows back the full performance of the SSD.

I'm unsure whether this is Windows' or the SSD's fault, but I do not understand why there would be any performance difference on other partitions while the OS is installed and running on the same SSD. Trim seems to be running (and was manually performed as well); data fragmentation on the benchmark testfiles does not seem to be occurring (while it won't destroy performance as with hard disks, it can affect peak performance also on SSDs).

wd-black-sn850-difference.png


EDIT: I've also already set the SSD to 4kB LBA (with nvme-cli from a Linux installation on a different SSD; reinstalling Windows is then required as it deletes everything and makes the drive incompatible with partition images made with 512B LBA), which improved performance marginally but did not solve this issue.

EDIT: It looks like this person on Reddit saw the same problem as I did: Windows 11 slows NVME writes greatly, on small (128GB) partitions? : Windows11 (reddit.com)
 
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blasteris

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In same manner update AMD drivers and adjust power plan PCIe settings.

Other than that I do not exhibit any performance degradation on my Samsung drive on Win11. Keep in mind those benchmarks are very single thread, high CPU clock dependent.
Changing/adjusting power plan did nothing. About which AMD drivers are you talking? Chipset drivers or some storage drivers? Because I only see some old drivers and RAID drivers.
 
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Changing/adjusting power plan did nothing. About which AMD drivers are you talking? Chipset drivers or some storage drivers? Because I only see some old drivers and RAID drivers.

Yes chipset one, and the latest ones, that are actually for AMD_Chipset_Drivers_3.10.22.706 by MSI.

Did a rebench. PM981 performs roughly the same for me. Rounded corners are w11.


1638375427160.png
 

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I thought those were my images, as i did the same testing months ago and even used MS paint with the same bad red text
The only difference is i tested vs a 970 Pro, not a 970 evo. serious deja vu there.

Windows 11 has issues with some drives, 4K writes are really low - and it's worse on smaller partitions <200GB)

There is no fix, yet.

This is the one i had around september?

1638914865178.png
 
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The problem seems worse if Core Isolation/Memory Integrity is enabled. Can others confirm?
The system partition is affected the most; other partitions on the same SSD may or may not be affected.

 

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I cant even load that screen (TPM/SB free install)
 

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use extreme caution when replacing the NVME Driver
I have seen many reports of unrecoverable BSODS On boot after installing a vendor specific nvme driver
 

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use extreme caution when replacing the NVME Driver
I have seen many reports of unrecoverable BSODS On boot after installing a vendor specific nvme driver
I dont think we HAVE any third party ones for windows 11 yet
 
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I wonder what exactly I am disabling or enabling that I do not exhibit any of those on my drive... I got actually better more consistent performance.

I use mostly tweaks given by W1z in the w11 tweaks sections, I disable anything Defender and exploit protection related. Hyper V is disabled also.
 

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I went back and found my old benchies and re-tested them, and my current Win 11 results are very close to the W10 ones now.


Same hardware, same OS - just windows updates and AMD chipset driver updates since then.

@blasteris have you installed the AMD chipset drivers for Win 11?
 
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@blasteris have you installed the AMD chipset drivers for Win 11?

Yea, I asked it too, as the benchies are very single thread/boost frequency touchy. As default W11 UEFI preferred cores/CPPC2 feature is non existent, AMD's do not boost to max speeds, thus the benchmarks are worse without the AMD driver and Windows patches.
 
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blasteris

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@blasteris have you installed the AMD chipset drivers for Win 11?
Yeah, I have the latest chipset (3.10.22.706) and other drivers, latest bios. I just don't get why my Win11 results are so much worse than Win10. Others get 10-20% better performance in RND4kQ32 in Win10, while mine are more than 300% in some instances.
The problem seems worse if Core Isolation/Memory Integrity is enabled. Can others confirm?
Can't test this. I assume you can toggle this only if you enable virtualization and if virtualization is turned off so is memory integrity?
 
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Can't test this. I assume you can toggle this only if you enable virtualization and if virtualization is turned off so is memory integrity?

Yes, the CPU's virtualization features first have to be enabled in firmware. Some drivers may also prevent you from toggling Memory Integrity.
 

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So decided to create a new partition and install a fresh win11 copy. And after installing latest chipset driver and all Windows updates, all my benchmarks (except RND4K Q32T16 writes) were like win10 or better. It seems that there's something wrong with my Win11. Don't know if it's correlated or not, but I formatted test partition in 4 KB allocation unit size. Before, I always used default.

Win11x2 default chipset update.png
Win11x2 NVMe. chipset.png
win11x2 chipset update.png
win11x2.png
 
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@blasteris : does repeating the tests (mainly the RND 4K QD32T16 one from CrystalDiskMark) on your system partition (usually C: ) show the same results?

Do you also notice whether in general CPU occupation is higher during these tests on Windows 11 than on Windows 10?
 

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@blasteris : does repeating the tests (mainly the RND 4K QD32T16 one from CrystalDiskMark) on your system partition (usually C: ) show the same results?
Did test on both partitions and looks like they are almost the same.
win11x2 default C.png
win11x2 default F.png

win11x2 NVMe C.png
win11x2 NVMe F.png

Do you also notice whether in general CPU occupation is higher during these tests on Windows 11 than on Windows 10?
Didn't look into it and already deleted partition with Win10.
 
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