woah! are you GS people who are hitting 650+Mhz voltmodded?!?
mine craps out above 560/800, idle 48*C load 67*C... I would vmod but I don't really have the guts, heh. I don't want to end up breaking it and then not being able to get a replacement under warranty, it took me ages to save up.
However, it runs games as well as I want, so there isnt really any need to fork out on a new cooler etc.
I may AS5 the stock cooler though, that should help. It has a 120mm fan balanced on top of the cooler, which drops the load to 67 down from 85 odd. (BTX case, so that is possible