Thats 2000 PPD running one SMP client at 98% usage across all cores. I get 5840- 6200 PPD with the GPU client depending on WU...
Your high CPU usage must be caused by your multi core GPU's. Strange still seems high. I'm no expert tho, just started Folding the end of june...
I just installed the client this morning
I'm doing 5800 PPD with my 8800 GTS 512! I hope it will help a bit hehe