I installed a new GPU recently. I installed a Radeon RX 480 (4gb). Upgrading from an Nvidia GeForce GT 780 (yes, I know, quite the jump). I was expecting an exponential jump in performance. What I got was worse performance than before. Games that I had run (albeit at 30 fps, low settings) now run at 1-10 fps. I can't imagine what is wrong with it. I've deleted old drivers and installed new drivers. Can someone please help? Thanks.