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my gpu usage in bf3 (or most of game) never be %95+

also it drops to %50's in midgame and my gameplay corrupted completely. (avg. 80+ fps and suddenly drops to 40-45 fps)

it is so annoying... there is something unstable, what is your opinions?

my rig;

i5 2500k @4500mhz 1.39v
gtx 770 @1300mhz 1.212v (oc'ed using by asus gpu tweak)
8 gb 1600mhz dual ram
THERMALTAKE Toughpower xt 675w PSU

i suspecting my psu that i think it does'nt supply enough power botf of OC'ed GPU and CPU. But i don't have any proof.

Pls Help.