So far the temps(according to speedfan) have topped out around 47-49c overclocked to 2.7ghz on stock cooling. The motherboard is a Compaq M2N68-LA (Ivy8), managed to overclock via Nvida control panel.
Those temps are well within limits. Have you monitored max temp history under load? If you come out of a game then initiate a temp check, this reading will be well below peak.