A friend bought a new Sapphire RX 590 just a week ago, and since then he been experiencing a poor cpu performance and a high gpu performance, I mean, that cpu was only at 22%-27% and the gpu was at 97%-100%... We thought it was the power supply or even the cpu but we try my own gtx 1060 and everything was running great, then I try his gpu in my rig and got the same performance even when I have a better cpu, ram, power supply and storage, so we don't know what to do now... Any ideas of what it could be?