My new 7900XTX will not post when installed in the top PCIE slot on my MSI X570s Ace Max. The system boots fine when it is in any of the other PCIE slots. It is not an issue with the 16x slot, since my old Vega 56 works in it just fine. I have updated the bios, cleared the CMOS, removed all of my M.2 drives from the system, and nothing will make the 7900XTX work in the top slot and I'm running out of ideas. When I try to run it, I keep getting post code 94, BUS Enumeration 32.
Any help or advice is appreciated.
SPECS
CPU : Ryzen R7 5800X3D
RAM : 16GB @ 3600mhz
Motherboard : MSI X570s Ace Max
PSU : 750W Super Flower Leadex III Gold