hmmm... are you actually looking for a GPU FAN
? or an aftermarket GPU cooling solution in general? im not sure i quite understand what you mean... i thought the 8800GTS always came with a cooling fan... or are you just looking to bring your temps down a little more? huh... well, ill throw some ideas out there anyways...
i know ive heard good things about this heatsink from Arctic Cooling:
ARCTIC COOLING ACCELS1 Rev 2 VGA Cooler
and if you put a 120mm fan on top of THAT, itll cool it even MORE...
or you could try one of these with the fan built in:
XIGMATEK VD964 VGA Cooler
but i havent heard anything about that one cept from reading the reviews on newegg...
worse comes to worse, consider investing in a small starter watercooling loop mebbe... would be specially nice for overclocking that BE CPU... just a thought... hope i helped a little
EDIT: went back and found that thread where i heard about the AC Accelero... here it is, if youre curious:
Little review on the Arctic Cooling Accelero S1 Rev2