Unusual/Unique problem in BIOS. 7600, B650M Gaming, 6700xt

Hi All,
Feb 6th I upgraded to AM5. Ryzen 5 7600, some deepcool cooler, Gigabyte B650M Gaming A AX (latest BIOS), 16GB Corsair DDR5 5200. Old Components: PSU: Corsair RM650. GPU: Nvidia 1650Super. Display : Acer EB321HQUD (60hz)
March 6th I installed new Gigabyte Eagle 6700xt. To avoid dealing with those known AMD driver issues I installed new windows 11 anyway to avoid troubleshooting that might be needed later. Long story short, everything works fine but the BIOS flickers like crazy when I use the 6700xt. I reseated the gpu twice, changed cables, DP ports, DP to HDMI, rolled back BIOS nothing worked. Windows boots fine, ran some furmark benches all good. BIOS works fine If I remove the 6700xt, BIOS is good on APU just like it was on 1650Super. Games running fine too.
I have 1 memory stick on B2, did not change that, no clue if that will make a difference.

Any inputs would be very helpful.
TIA.

Lo and behold, I used a different monitor (22" dell) and everything is perfect on it. Both screens have same 60hz refresh rate. I am sorted.

https://vimeo.com/805970705