Question Multi GPU setup

[CosmicEgg_]

Hi guys,

I'm currently trying to setup a pc with both a gtx1080 and a rtx3090ti but i'm strugling to get it to work.

I tried many thing but the current result is the 1080 booting with a code error 43 in device manager but work after a disabled enable and the 3090ti get a code 45 and doesn't work at all.
Best I got was the 1080 working perfectly and the 3090ti showing up with no error but displayed 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 reinstallation, checked psu, monitor and motherboard connections, etc.

Does someone has an idea ?

 

[COLGeek]

What are the complete specs for this system? We need to know the make and model of each installed component. Details matter.

 

[CosmicEgg_]

Yeah sorry I forgot these, my bad.

-ryzen 7 5800x
-asus x570 e gaming
-32go 4x8 ddr4 3600mhz
-asus 1080 o8g
-nvidia 3090ti fe
-corsair 850w (main psu)
-generic 650w (psu for the 1080 only)
-2 m.2 nvme
-win 10 (up to date)