Not sure if this is the right place to ask but I have a doubt.
I was mounting a new rig. Initially it used just a rx 570 8gb: worked fine. Then I added a rx 480 8gb through one of those pci express usb adapters that turn x1 slots into x16 ones.
At first both gpus stopped working altogether, windows was giving code 43 (even when i plugged them individually). Did some trouble shooting and found the issue was probably windows installing conflicting drivers; reverted both of these card's bios to the original one then did a DDU and they started working fine again.
However, now when plugging on the same rig again (one on the x16 slot and the other on the x1 slot through an adapter) the one plugged through the adapter is extremely unstable. MSI afterburner shows its values oscilating like crazy at idle, the pc keeps freezing slightly every 5 seconds and the fans also stop spinning randomly. Impossible to use it like this.
Both cards are on their original bios, haven't flashed back to the modded yet since I wanted to test first. And from my estimations the psu should be enough: It's a 550 corsair and hwinfo64 tells me these cards only draw 100w each while at heavy load. At the very least the psu should be enough to keep stable in idle.
Plus, the fact only the card on the pci express adapter is causing problems tells me the problem is the adapter itself.
Anyone know what could be it? Or anyone with experience using those adapters suffered something similar? It's that one with blue slot and blue USB cable.
Would appreciate any help.