(FIXED) SN850 1TB NVME - slow write speeds (3100) on x570 using M2 Chipset slots (PCH) - confirmed as a problem on MSI, ASRock, Gigabyte and Asus motherboards

[ftln94220]

Hi,
Please check in aida64, post screenshot of PCIe bus where your SSD is located.
In the screenshot attached half way down you can see the Maximum payload size on this bus for my motherboard is 128bit and I get low write speeds (3.2Gbps), when I disable Thunderbolt 3 and onboard Wi-Fi (these devices are on same bus as SN850) this max payload then rises to 256bit and I get full write speed (5.3Gbps) on the SSD. This is definitely the cause, so post screenshot of your pcie bus. Hope this helps