I tried reinstalling windows,drivers etc.
I cleaned the whole pc, checked the problem if its overheating and its not.
Benchmark doesnt crash the pc even If I maximize everything.
Im using r980x xfx with windows 10 pro 17763 with 8gb ram.
The problem occurs mid game, its fine for few matches of overwatch, fortnite, apex, rust etc.
edit: Also if I dont underclock the gpu it crashes immediately.