I recently bought a graphics card (rx 580) to replace my old one (gtx760) and I'getting performance issues. The games I used to play at like 60 fps with the 760 now with the 580 I'm getting less to equal fps with the exact same settings. I've already formatted the computer and installed the newest updates, installed the amd software for the drivers (amd adrenalin 2020) and it is still the same. For what i've seen my Vram never goes above +/-1400, and the gpu usage is always floating from 99% to X to X to 0% and then back to 99 again never stabling. I know this Cpu bottlenecks a little but it isn't supposed to be this bad, could it be the pc RAM? Or event hardware malfunction or something? I honestly don't know what to do more...
CPU: i5-4670 @ 3.4GHz
Old GPU: Geforce Gtx 760 2GB
New GPU: Asus Arez Radeon rx 580 8GB
Motherboard: Asus H87-Plus
Ram: 12GB- 8GB(2x4 1600MHz) 4GB(2x2 1333MHz)
PSU: Corsair cx600
Windows 10 64 bit