I think a good number of people who had temp issues including myself solved it by overclocking it past 400mhz on the core.
First time I loaded up the 71.84 (I think) and tried running a benchmark, my computer crashed and the 6800gt died for 15 minutes. I shit myself when that happened but all is fine now
rumor is the drivers have control over the voltage, but only nvidia knows how to control the voltage through the drivers... notice the clock diff between 2d and 3d mode.. theres a voltage difference that goes along with that and when the drivers arnt loaded its in 3d mode