Hi all, just found one possible sollution to the extra heat produced by an SLI set up. Was looking at the nvidia forums when I noticed a post from "Raptor" (so all credit to him) saying that he noticed small screw holes at 80mm apart on the back of his GTX580 and whether you could attach a 80mm fan to the back of them. So I went exploring, my GTX480's have the same screw holes. Concerned about the amount of extra heat my new first SLI bulid was producing I purchased an ANTEC TRI COOL 80mm fan and attached it. I dont bench at all but during gaming (BFBC2, max settings) I now get a nice and cool 60-75degC on the 2 cards as apposed to 80-90degC, a nice 15-20 drop.
Thought it might be a good option for those who don't have space or mounting holes near the drive bays for extra cooling of an SLI setup.
I've attached a pic of my setup.
Once again credit must go to "Raptor" over at Nvidia Forums for bringing this to my attention.