According to the report from Tom's Hardware, WD is working on a firmware update for WD Black SN850 M.2 NVMe SSD that has some performance issues on the AMD X570 platform.

The SSD works flawlessly on AMD B550 and Intel platforms with support for PCIe Gen 4, but apparently, on certain AMD X570 chipset motherboards, PCIe maximum payload size (MPS) value set at 128 bytes, which in terms cripples the performance.

According to the same report, the firmware update should be ready by July 12th, so in case you are running the WD Black SN850 NVMe SSD on the X570 motherboard, you should keep an eye on WD's support page.