Quote Originally Posted by hollo View Post
maybe they have some kind of power-saving feature that underclocks them when they're not doing high-end 3d stuff, like CPUs do
The R600 and R670 have about 9 clock frequency "domains" in the GPU. I think that these domains are all tweaked already in idle. At least the most important domains (TMUs, ROPs and shaders) are all clocked down in 2D mode and vGPU also drastically drops.

If those idle power numbers are real they must use something to completely shut-down parts of the GPU in 2D, which is something I've been waiting for