Question Problems with Multi GPU setup ?

[CosmicEgg_]

Hi guys,

I'm currently trying to setup a PC with both a GTX 1080 and an RTX 3090 Ti but i'm struggling to get it to work.

I tried many things but the current result is the 1080 booting with a code error 43 in device manager but work after a disabled enable and the 3090 Ti gets a code 45 and doesn't work at all.
Best I got was the 1080 working perfectly and the 3090 Ti showing up with no error but displaying nothing.

I can provide more informations on what I already tried and the result, I just don't that here it will be insanely long but I tried differents drivers, Windows reinstall, checked PSU, monitor and motherboard connections, etc.

Does someone have any ideas ?

 

[CosmicEgg_]

Yeah that's the usual, people have no idea what they are doing.

I hope he did not knock off some components there too trying to force all that together.

The worst part is when I reach out to that guy to know if the card was in fact working he accused me of having messed up when reapplying thermal grease