Tried overclocking. After that my pubg started to drop down to 25-30 fps. Suddenly It's back to 55-60 fps on ultra settings. In one match sometimes it dropps down to 25-30fps for one to two mins then comes back to 55-60fps (this cycle happend several times). Pes 19 legging but not showing fps drops on screen. But pes 18 and witcher 3 I tried was just fine. These things happened after I move back to stock everything. Some minutes ago i shut down the system just before finishing shut down gpu fan just speed up to max looks like (heard so loud sound). My gpu is Gigabyte rx 580 4gb.