+1 for afterburner, excellent app, up the core 10 mhz at a time, test with benchmark or demanding game., crysis benchmark, dirt2, lost planet 2 are ones ive been reccomended and used. Quite a lot of 470's seem to be doing 750-770mhz core clocks on stock voltage, 750 here at 0.987, (stock volts, gigabyte 630mhz factory oc cards) 800mhz at 1.012.