well instead of rigging a 80mm fan on the graphics card...
you can get a pci rack http://www.xoxide.com/sunbeam-wherever-pci-rack.html
im not sure how it works.. i was just surfing the internet and found it...
basically it allows u to add a fan (hard drives too although it doesnt seem like a good idea... dont know how much weight it can hold)
and you can position it under your graphics card or even on top of somewhere around ur motherboard (according to the pictures)
its kind of a nice add on to ur computer
im not sure about the installation... but it doesnt seem to affect any of ur pci slots