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From the above outcome, I can conclude that 1. the "lowest x16 PCIe slot" is tied to IOH1, which is one of the CPU socket. 2. the so-called bifurcation is a flop What I am using to test is a non-switched brandless 4x NVMe to PCIe3 x16 adapter card. On the card, its port1 worked when IOH1+IOU3...

IOH0 PCIe Port Bifurcation Control IOU1 – PCIe Port [x4x4] = Port 1A, Port 1B IOU2 – PCIe Port [x16] = Port 2A IOU3 – PCIe Port [x4x4x4x4] = Port 3A, 3B, 3C, 3D IOH1 PCIe Port Bifurcation Control IOU1 – PCIe Port [x4x4]...

The above x4 lane worked when I configured BIOS chipset bifurcation settings as below: IOH0 PCIe Port Bifurcation Control IOU1 – PCIe Port [x4x4] = Port 1A, Port 1B IOU2 – PCIe Port [x16] = Port 2A...

Even though it is obvious the AMI BIOS of this chinese mobo has some kind of PCIE3.0 bifurcation support. I tried inserting a x16 bifurcation card with 4xNVMe (WD SN570) and it showed only 1 NVMe (“Sandisk Corp WD Blue SN570 NVMe SSD”) when mobo bifurcation was at x16, and when mobo bifurcation...