[how much does the 8800 GT pull in, exactly?]
Probably 4400-5000 depending on shader clock speed.
My 8800GT 256MB cards are doing 4700ppd each @ 650MHz core clock (shader clock linked). It seems with a couple different projects I can get 5200 though (rare).
I de-linked my shader clock from the core clock from the start. I increased its speed 10% and am usually getting reported PPD of 5300, sometimes a bit less, now and then as much as a claimed 5670 or 5760, I forget which. At any rate, I think de-linking is probably the best way to go so the core doesn't limit the shader's speed.
I don't really know for sure, of course, because I don't know diddly about these modern video cards any more.
All I do know is that anyone who wants to help the team a lot and has a PCIe slot to spare should buy one, either new or even used from eBay. I'm considering a couple for my main machine.