I am using speedfan, and it says that I am running temps at around 48-52c idle. These match the bios readings. under load, (i.e. GRAW again), i get 68-69c, at 69c my graphics always freezes up, computer still runs, as i can alt-tab out, and the graphic for desktop is fine. strange thing is that according to Nvidia's graphics card reader, I never get to the yellow tempeture warning, alwas in green. but also, graw is having problems, its the only game I've run that has had problems, and it crashes on load alot. so I don't think its all temp related.
As far as overclocking... I am using a Systemax computer and I am able to change the clock speed in the bios, the apg clock speed, and memory timings. I believe that I will be able to overclock. I can adjust cpu clock from 200->250. I don't see multiplier though...