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"Just press the OC Genie button or enable OC Genie II function in BIOS menu"
It's 'Function' is in the BIOS -- just set the CPU Ratio to 42 if 4.2GHz is the goal, and IF needed increase the CPU voltage to 1.25v from the 1.20v stock.
In either case always run Prime95 and monitor the Temps.
And yes, duh the OC Genie does the same -- it a psychological thing only.