WD Black SN850 SSD Loses Over 40% of Performance When Connected To X570 Chipset

[Purgatory]

https://www.tomshardware.com/news/wd-black-sn850-performance-issues-chipset-m-2


Original article from computerbase:-

https://translate.google.com/transl...reibrate-ueber-chipsatz-slot-wird-untersucht/

 

[Deluxe1]

X570 here and I have 2 1TB 850's one connected directly the other in the pcie slot.

 

[Tejstar]

Interesting, I have my SN850 connected directly (CPU side) and have great speeds. Never tried it in the other (chipset) slot to see if there is a slowdown.

 

[Raiden85]

Haven't tried the chipset in months and I've had quite a few BIOS updates and even a drive firmware since, but my SN850 2TB when on the chipset definitely ran quite a bit slower on read and writes.

That Q32T16 bench above seems low compared to what my drive is though. On writes I've never been able to top 5000MB/s+ on writes but it's close enough.

This was on an Asus X570 connected to the CPU.

 

[Deluxe1]

Haven't tried the chipset in months and I've had quite a few BIOS updates and even a drive firmware since, but my SN850 2TB when on the chipset definitely ran quite a bit slower on read and writes.

That Q32T16 bench above seems low compared to what my drive is though. On writes I've never been able to top 5000MB/s+ on writes but it's close enough.

This was on an Asus X570 connected to the CPU.

Which Asus do you have I've got the Hero VIII. Tried it again on the latest version of CrystalDiskMark:

Ran it with my SN750 and the Q32T16 score was more or less the same as my 850's so for some reason looks like that's the limit for me..

 

[feck199]

Well at-least it’s working for some. Awaiting a dark hero and this ssd at the moment. Don’t really want to change the order any more than I have.

 

[Tejstar]

Looks like a firmware update is coming to address this issue on X570 boards.

Western Digital Readies WD Black SN850 Firmware Update Restoring AMD X570 Performance

Western Digital is reportedly preparing a firmware update for its WD Black SN850 M.2 NVMe SSD that restores the drive's write performance levels on PCs based on the AMD X570 platform. This problem is localized to X570, specifically to when the drive is installed on an M.2 NVMe slot that is wired to the X570 chipset. Drives that are installed on the slot that's directly wired to the Ryzen processor perform as expected (Ryzen 3000 "Matisse" and Ryzen 5000 "Vermeer").

The drive performs as intended on AMD B550, as well as Intel platforms that support PCIe Gen 4, as the only Gen 4-capable M.2 slots are the ones directly wired to the processor. Western Digital localized the problem to certain X570 motherboards that have their PCIe maximum payload size (MPS) value set at 128 bytes. This dictates the maximum transaction layer packet (TLP) that goes through the PCIe controller, and a low MPS value cripples performance. The firmware update by Western Digital possibly works around this limitation. The company is expected to release the firmware update by 12 July, 2021.