Ok so I've overclocked my imac 5750 to 765 1082 on windows 7. I cant go much farther with that without my screen going black and then fixing itself. I think this is voltage related and I was wondering if anyone has tweaked the voltage to overclock a little more.(safely). What program did you use, what did you have to change, have you had any issues with it, what were you able to overclock to after the volage change ect ect. If anyone has info on this I would love a response. Thanks.