FPS drops - Not overheating

Hi everyone.

I need help to solve this. Two months ago my pc started to have fps drops from 180 to 30 every 30/40 seconds. This had happened to me in the past but I don't remember what I did to solve it since it was a year ago.

I tried:


Checking the temperature: It was fine.
Updating drivers: They were fine
Testing if the drop happened on other games too:
Buying a new graphic card because the other one was really old.

PC Specs:

Ram: 12gb(one of 8 and another of 4)
Graphic Card:AMD Radeon R7 370 Series
Processor: AMD Phenom II X6 1055T
HDD: Main one(windows and system stuff): 120gb. Second one(this is where I have all my games, music and stuff) 1TB.

Software:

Windows 7, 64bits.

I'm going to leave my cpu-z.txt so you can check anything if you need to: https://www.mediafire.com/?cmcbceidhtomg18


I'm going to re-install windows but if it doesn't work I'll still need help.


Thank you very much for helping me.
 
EDIT:


Games: League of Legends (happens even in my own base)
CS:GO(same thing)
Aion(same thing)
Even minecraft.


PSU: ERP700-SS Sentey
 
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