Hey Oily17 I can corroborate your findings. I stopped Folding ATI for exaclty that reason. I have 3 HD3870X2 that no longer Fold because of the apparent incompatability with WCG. I tried setting affinity and the only way I could get it t play was to run WCG on 3 cores and F@H on the other. Running 4 clients of WCG would cause a variety of issues on top of slow production, changing the CPU usage in the WCG Manager only made the load cycle which I feel is bad for the CPU. However, using Vista 64 Ultimate shows less CPU usage for GPU Folding than XP 32. I can run 4 instances of Nvidia GPU Folding@Home (2 9800GX2) and still use all 4 cores for WCG. I see no lag at desktop, I can still use the PC for anything I want without issue. However the ATI rigs cannot handle it and lock up or get EUE time outs or just become unusable for desktop stuff.