ya, its pretty much like ati tool, but much more details, you can have far higher resolutions and add AA and AF and such
and i think 10 min should do good with your max res with some AA thrown on
but either way its apperent your card is degrading.... you should RMA it anyway... i mean weather you get another 8800gtx or 9800gtx(+) you'll be happier and save yourself the trouble of it completely dying on you later on
agreed w/ lukas.... the card should not be getting that hot under load....
and try rolling back on some older drivers and giving ati tool another try
but reguardless... complain about the temps and just tell em you computer restarts when you play games.. lol
100C....horrible, rma that crap.