So to further troubleshoot, I placed the GPU into the secondary x16 slot and now it works and posts and I can boot into Windows just fine.
However the secondary slot appears to be fixed at Gen 4 x 8
This leads me to believe there is something going on with the motherboard and to confirm things I attempted to flash the BIOS, it is failing.
Gigabyte is showing an F36 revision as the latest but it is not being read if I try to use the Qflash utility nor will it flash from using the Windows based @BIOS app.
I have not tried a flashback on a USB pen drive yet but I have my doubts do to the what the Qflash utility is stating, can’t read file.
I wonder why the Primary PCIe slot is behaving this way ?
Maybe it is something with the motherboard or the slot is broken in same way.
Having the same board and a non reference 6900XT, make sure you’re downloading the correct bios for the version of the board, there’s version rev 1.0 and versions rev 1.1/1.2 which have different bios releases, for my board i would normally download the bios update from gigabyte website, unzip it then throw it in the root dir of one of my drives and then flash directly from UEFI Qflash.
Also on the board there should be a physical switch to change between bios 1 and bios 2 so you can try the usb flashback on the second bios if and still be able to boot by switching back to the other.
Pretty sure I have the rev 1 board as the F33i BIOS only shows under this revision board and that is what I currently have flashed onto one of the BIOS chips.
So far the secondary PCIe slot is working properly and detects after multiple reboots to test.
I may just leave it this way until the release of the next AM5 platform and see what is available.
But who knows, maybe I will look at the Raptor Lake stuff by that time too.
My father is still rocking an old AMD FX-8350 CPU system with an old RX-380 GPU
So maybe swap out his system with my old mobo + cpu + ram + gpu would be a nice upgrade and I can mess with the BIOS at that point.