Important question: Are the two graphics cards can overclok at the same frequency?
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I have the stock card. It takes you about 10 seconds to oc it to 1050/1250 to match the OC edition. Don't waste your money on a factory overclock. So far I have gotten my card up to 1150/1250 without changing the voltage.
have applied default OC at boot? with a program? Which one?