Can I overclock a 7850 on a 450w psu?

kebbz

Honorable
Jul 27, 2012
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System spec:

FX-6300 (OC to 4ghz with 1.3v)
HD 7850 (SOON)
2x4gb DDR3 1600 Hyper X black
1 HDD 500gb

PSU: Thermaltake Llitepower 500W. (Peak power 500w)

Am I safe to OC the 7850 to at least 1ghz?