My review has the Cryostasis tech demo benchmark, comparing a GTX 480 to a GTX 260 CORE 216 55nm SLI setup, and a GTX 480 + GTX 260 CORE 216 55nm for PhysX.
http://www.gnd-tech.com/main/showthr...GTX-480-Review
As for the actual game, I get 50-70 FPS when nothing is happening. Close encounters with enemies gets me to 30-40 FPS, same applies to heavy PhysX calculations with no enemies around. If there are lots of PhysX calculations going on, and several enemies on screen, then it brings me down to 25-30 FPS. I run the game maxed out at 1920 x 1080 (including AA/AF). All of this with my GTX 480 overclocked to an 863 mhz core clock, 1725 mhz shader clock, and 1050 mhz memory clock (4200 mhz effective data rate) and a GTX 260 CORE 216 55nm SC dedicated to PhysX (626/1350/1053).