Cpu gets too hot

Hello guys, today my cpu is getting too hot when playing games and my fps drops also . usually when i play cf my cpu temp is ony 52C and my fps is 200-250 but today my cpu is 75C and my fps now is only 40-60 . Do u know guys why my pc gets too hot and my fps dropped ?(sorry for bad english) THANKS !

My pc spec

Amd phenom ii x4 965 with stock fan
Mobo: m5A97 le r2.0
Graphics :sapphire 7870xt
Ram 8gb

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