I have a 5970 and I noticed when I'm on the desktop looking at ati overdrive the current gpu speed is 507mhz which is well below its stock speed of 725.
Is that a problem?
I don't really see anywhere in ati overdrive that allows me to force it to a minimum of 725, but at the same time I'm not sure if that severe downclock messes me up in any way. I guess I don't really need the card to be performing at the top of its game when I'm on the desktop. When I run a game it jumps up to my settings immediately and seems to do fine.
For my 5850 (OC'ed using CCC) it still goes down to 500/750 (like the old cards did) which is a bit, but a far cry from 157/300 (I think). Not a bg deal as its main purpose is gaming (3D clocks) but odd nontheless.