It does downclock, though not as much as you might think (mine drops to 500 core/2000 mem from 750 core/3600 mem). Still, it runs quite warm at idle. I wouldn't worry about it too much, as they are designed for the temps. If you're worried though, the fan on it is ridiculous, and you can achieve pretty much any temps you want by bumping the fan up. It's really loud at the higher speeds though.