check the temps man, it could be the psu (from experince and 2 broken pc), it could be the startup, just check the task manager they will find the background app using your gpu, owh and a bit advice, if this is a pre built, try to debloat it, the bloatware on some prebuilt or SI usually use 30% on the Gpu alone tho, if its not a prebuilt then still debloat it (if you really hate cortana and one drive
(sorry bad english)