Random fps drops on random games

driftingcris

Distinguished
Mar 25, 2011
32
0
18,540
Hello guys! Happy new year.
Well i bought a used pc just for some CS GO, LoL, Path of Exile and some Dota 2,
specs here:
Thermaltake matrix case
Asus M4A78
Athlon x2 240 2.8ghz
2x 1gb Kingstone Hyperx ddr2 800mhz
Palit 9800gt green 1gb ddr3
Thermaltake 550watt psu
All the games i wanted used to run nice on my 1280x1024 monitor.
I got a used cpu (Athlon X4 630), and i added some ram from my old pc(1gb dimm muskin 667mhz)
Everything seemed to be fine, but 3 or 4 days now i experience many fps drops on every game i play. I didnt change any of the display settings. Changed all to the lowest and i still get fps drops. eg i run cs go on medium with 90fps, and suddenly i get 2-3fps for a second or two. Then 90fps again. This may happen after a min, maybe after five.
I did a clean windows install
I updated my drivers to the latest(including audio drivers)
Run a 10hours memtest
Got a new HDD
I actually tried everything. My temperatures are perfect(35max on cpu with aftermarket cooler, 59max on the 9800, 35 max on the mobo)
Please help me guys :'(

edit: when i play usage of cpu is goin max 93%, and 98% max on the gpu(according to hwmonitor)