CPU overheating massively after instaling GPU while gaming

Mar 8, 2018
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Hi
I have recently got a Gtx 1050 ti 4gb for better gaming graphics for my PC, it was doing good for the first few days of usage and was doing well on Fortnite but after these couple of days after an hour or 2 hours of fortnite gameplay the PC started to shut down automatically (no shutting down screen) just an instant black screen with no warning. So i had to switch it on again and after 30 minutes it would do the same thing again. I recently noticed that my max temp for my CPU was 80 celsius (AMD FX 6300 Six-Core) and was peaking 92 celsius after an hour session. Whats happening?