I don’t think it has anything to do with temperature at all. First at a 6MHz OC the pointer is all the way over to max redline. Second I have dropped my card temps from 47/76 to 33/64 and overdrive is still 6MHz tops; I've tested this on three XTPE's with and without additional fans blowing on the cards. All reviews also only show 6MHz OCs with overdrive.
Get a free OC tool and do it the right way
