random lag in middle of game

Ananda Deb

Distinguished
Feb 13, 2014
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0
18,630
my pc starts dropping frames randomly after playing games for some time
if its a game like witcher 3 i can play the game for 1-2 hours without any problem after that it starts lagging
if its game like league of legends then i can play 5-8 hours without problem before getting frame drops
here is my specs:
CPU: intel i5-4670k 3.40 ghz
GPU: gtx 770
RAM: 8 gb
OS: 8.1
 

Ananda Deb

Distinguished
Feb 13, 2014
70
0
18,630
and also at idle my cpu temp is 46 c
does that means its because of my cpu ?
ok saw my gpu usage with my nvidia gpu tweak
its 99% and my gpu temp is 80 while playing withcer 3
while playing witcher 3 my gpu memory usage is 1200 mb