Ok I really got the folding bug and (also new hardware bug)

so I'm now running a core i7 920 @ 4ghz (still on stock voltage... will maybe try more... but now I was testing it for folding). What I have to say is that the i7 is really impressive! (27500 ppd right now).
Ok here is my concern. I still have the Q6600 in my sig paired with a 9800 GX2. The thing I don't know... is where to put the GX2 to have the most PPD of my 2 system together. Other thing also is that the power supply that has the 6 pins and 8 pins plugs for the GX2 is right now on the core i7 system. I don't know if I want to put the GX2 on the core i7 system, because I will surelly lost a good amount of PPD running it 7 cores... but on the other side, if I put the GX2 with the Q6600 rig, I need a new powersupply (because the OCZ powerstream 520 didn't have the good connectors....
What do you think of this situation? My goal would be 40 000 PPD....