My R9 390 goes up to 75 degrees and stays at about 72 while playing pubg , i think it makes my cpu go hotter aswell , and the top of the case is warm to touch back aswell. I have 1 top exhaust , 1 back exhaust , 1 front intake and one side intake Case is Deepcool Tesseract. Cpu is i3 8100 with hyper 212 evo and when gpu is hot it , cpu goes up to 60 max