Also an older one to benchmark with is Cryostasis. They have a techdemo you can grab and test out your physx.
It's a bit of an older title, but I think the first F.E.A.R. utilizes PhysX and also has a built in benchmark tool. Can anyone confirm?
Eww. I wouldn't. With what little attention that game got even that much was overhyped. It really let me down. I still can't believe gamespot gave it an 8/10. I liked what it was trying to do, but poorly executed.
Did you play the game all the way through? I personally found it to be quite brilliant. Really picked up towards the end and all. Great game and GREAT Physx!!!