Been running a pair of 470's at 751/1502/1684 for over two months now, ran theese clocks at stock voltage, 0.987 according to msi afterburner. Been rock solid in games at theese clocks. Ive had them upto 800/1600 on 1.075. Been experimenting a bit with voltage settings, trying to drop the voltage down and use 800/1600 for my daily gaming clocks. Started on 1.00v, ran heaven 2.1 but it failed, upped the voltage to 1.012, passed 5 loops of heaven at 800/1600/1684. Is the heaven bench any good as a stabilty indicator, dont want to go messing about with furmark tbh, but ill try a few other benchmarks such as 3d mark and various games i have installed.