OC'ing VC 50%CPU usage. Why???

Chard

Distinguished
Dec 31, 2005
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Can somebody tell me why my PC is running 50%CPU when OC'ing my Video card?

My Specs:
Intel 2.4C HT @ 3.00Ghz
GA8IPE1000
Inno3D 6200 256MB 64bit 8x
Nvidia 81.95 Driver
2x(Twinmos 256mb)PC3200