I currently have a Gigabyte 5700xt and a 2600x CPu, and I booted with my new GPU yesterday after having a RX 580 for around a year. The first thing I did was decide to benchmark a few games, and the stuttering was just awful. I got around only 120 fps in a CS Comp match, and while testing AC: Origins my fps constantly was dipping from 70 to 0 and back to 70 again. during the entire benchmark. Are there any suggestions? could it be my Corsair 550W PSU that is limiting me? It said it recommended a 700, minimum 600W PSU, but I read that a 550 would be more than enough. Also if it helps, my CPU went from only a few percent usage on start to very high, same with the amount of power consumption for applications.