Wow you're getting temps in the 80's? Mine have never been that high and I'm at a higher overclock than that. Doesn't your rig have good cooling? What's the ambient temp in your room?
And by the way, I don't trust ati tool (even though from what I've read, it is reliable) for artifact checking. The way I look at it, if it can pass 3DMark06, and if I can play my games just fine with no tearing, glitches, etc, then my card is stable. I don't care about getting artifacts in a program like that, because I don't use my card to run ATI Tool. I use it to play games. That's just like overclocking your CPU, and then checking for errors by running Orthos and getting all worked up because you got errors. Well, what did you overclock the CPU for? To calculate pi, or to play games? (Sorry if that analogy didn't make sense, I am doing a lot of things right now).
uh I thought all 8800 gtx cards will get to 80 at least when using scan for artifact for at least 30 mins since it pushes ur card to the max. The load temp for games however for me only reaches like 74ish max