Don't know if it will be the same with your set-up but my i7-930 rig needs to finish a big-adv unit before win7 gets the priorities right.
PPD was way low at first (~28k) then went back up (~36k) after completing a WU (p2685), this is with 2x 460's running the p6811 WU's.
On the gpu clients I have "Disable CPU Affinity Lock" set to Yes.
Maybe let it finish a WU and then check it again...
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