I dont think SLI is working in this instance. I would expecxt a higher score. I have a 2500K with 2xRadeon 5850 and I get >< 7000 points. I would expect 2x GTX480's to get a higher score than 7000, I'd guess more like 8 or 9 thousand atleast. Check you settings. Try running 3DMark11 with the "scan system info" option turned off (its on the help tab).