If you run at stock speed, I believe the GPU will run at 157Mhz, or something like that. and the Memory at 300Mhz, or something like that. As soon as you overclock the GPU runs at 400 in 2D and memory at the max set clock. This changed with some of the recent ATI drivers. I don't know why they did that, but it is very annoying. I have not overclocked my card for this reason. The idle temps go up 10C and i think its a waste to run that high surfing the net. There is nothing wrong with running the card like this, it just seems to be something that changed in the more recent ATI drivers.