I know this is an old thread but I have a similar question. I have a Crosshair VIII Hero Wifi and I currently have a Sabertooth PCIE 4.0 1 TB NVME installed in the M.2 slot closest to the CPU. I plan on upgrading to a Ryzen 5900X as well as a RTX 3080. If I add a 2nd NVME in the other M.2 slot...