I’m currently testing the capabilities of the ASUS Pro WS X570-ACE with the latest UEFI 1201.
The reason why I’m fixated on this model is that it is the only AM4 board where you can use 3 x PCIe x8 AICs.
2 of the 3 mechanical PCIe x16 slots are handled by the CPU (x8 each), the lowest one is coming from the X570 chipset and also supplies 8 lanes.
Due to the PCIe 4.0 x4 interface between the CPU and the chipset, you can use a PCIe 3.0 x8 AIC at (nearly) full performance.
Since GPU performance is absolutely not relevant I want to install the only GPU of the system in the PCIe x1 slot that is open towards the front so you can also install x16 AICs in it.
But when I install a test GPU in it (Quadro P2000) it the motherboard won’t POST. The three large PCIe slots work just fine with a GPU.
Tested a CMOS reset, no help.
Is there any “real” reason why the X1 slot cannot be used for the only GPU of the system? The GPU doesn’t have much power needs (TDP 75 W, no additional power connectors). There is no other device installed on the motherboard.
Thanks for the assistance!