It's been a while since I crunched any MW. Kat's rig is back online now and she wants to crunch MilkyWay, of course. So...I fired it up last night, and realized this morning that the WUs are taking way longer than I remember them taking. She's got the 2GB version of Sapphire's HD4870 clocked at 790MHz...but I can't figure something out. It's only loading the GPU at like 70%. It is crunching Collatz, FreeHal and WuProp on the CPU if that matters. Also, if I suspend MW and let Collatz crunch on the GPU, Collatz will load the GPU to 98 or 99% like it should.

Any ideas of what's going on with MW here and why it won't load up the GPU higher?