Why Are There Green Pixels After Installing My New GPU?

I recently upgraded my graphics card from a 3060 to a 7900xtx, and everything seemed to go smoothly during the installation. I used DDU to get rid of the old drivers and installed the new ones without any issues. However, when I powered on my PC, I noticed these annoying green flashing pixels covering my screen. I've tried using DDU again for a fresh driver install, but that didn't help. I've also switched between three different cables and two monitors, and I've reseated the GPU along with all its connections. Sometimes the issue goes away, especially after launching a game, but it comes back after a restart. I could really use some advice on how to resolve this issue!