So I finally found some time to play with this again.
Re-flashed the bios, and tried min to many peripherals, to see what would work, and what wouldn't.
So it seems I have PEX errors, and lots of them. The 5090 works again, but I can see PCIe PEX Errors Recovery Counter numbers. Like 46 for the 5090 (even pegged the 5090 to pcie 4.0 - Which improved the numbers, but I have PEX errors no matter what HW is installed it would seem).
5090 46 errors
3090 21 errors
3090Ti 19 errors
A10 (enterprise card reports very little to Windows Workstation) so sat this one out.
All the above from
HWMonitor.
HWInFO64 doesn't even initialize past the bus scan:
View attachment 48097
So did I managed to get a bad board?
As an aside, a buddy claimed my 3495X Xeon would game horribly, so I looked up his 7800X3D, and found I placed top 1% globally for 3Dmark's Steel Nomad DX12 and 5090.
Doesn't seem so 'horrible' to me:
View attachment 48098
Just more people who don't know what they're talking about.
Regards.