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ROG STRIX Z790-A GAMING WIFI II - BIOS Bug? VGA not detect at x16

Level 7

You will not believe me if I tell you what problem I ran into. SYSTEM SPEC:

14700K - EVGA 3080Ti XC3 - 2x32GB 6600 Corsair Titanium - 2TB 990 Pro

My graphics card does not recognize the mentioned motherboard. I have fairly good experience in DIY PC and troubleshooting plus having a good amount of spare parts for testing.
This system works with 6900XT and Quadro P400 graphics without any problems. My card is also recognized well on the Ryzen 5700X and B550 TUF motherboard.
I downgrade the processor to 13700K and the BIOS from 801 to 507. I reduced the card generation from Gen5 to 4 and 3. I tested the graphics card with an x1 riser in other PCH slots. I removed all peripherals, even the boot drive. It was useless. nothing. 3 BIOS beeps mean no image signal. Of course, I got display using the UHD 770 and confirmed that the device manager is not showing the 3080Ti.
Finally, setting the slot to x8/x8 cards miraculously returned to normal. my 3080Ti Passed stress tests but works on x8 Gen4 obviously.
What do you think? I guess I need to wait for an update or something like that.


Super Moderator

Hi @De1222 
Did you attempt to update the GPU VBIOS?

13900KS / 8000 CAS36 / ROG APEX Z790 / ROG TUF RTX 4090

Level 7


Yes. It has the latest official vBIOS.

Level 17

I'd be tempted to take an image of the OS and then try a fresh install (since you changed the CPU). If that doesn't help, then you can restore the OS and at least you'll be no worse off.

Take a backup of all files as well first, then if the reinstall does help, you'll be ready to put any files back on. 

Z690 Hero, BIOS 3401, MEI 2406.5.5.0, ME Firmware, 7000X Case, RM1000x PSU, i9 12900K, ASUS TUF OC 3090TI, 2 x 16GB Corsair RAM @ 5200MHz, Windows 11 Pro 23H2, Corsair H150i Elite AIO, 4x Corsair RGB fans, 3x M.2 NVME drives, 2x SATA SSDs, 2x SATA HDs.

Level 7

Test with new 1002 BIOS, Still nothing.