This is weird. Did MW re-code and cave in to OpenCL then? It used to be "native" ATI code, and was very efficient. I could get loads of 98 - 99% all the time back when I crunched on both a 4870 and 5870. Hmmm...I will have to look into this. I wonder if I suspend the CPU work if that will make a difference? I'll try some different scenarios when I have time here between patients and report back.