9600 had 64sp's. The 240 has 96. I don't think memory speed has much baring on PhysX performance.
I bought a Palit 240 and run it as a dedicated PhysX card without issue, Batman AA runs perfectly with high PhysX settings and I even removed the fan to run it with passive cooling without issue. All powered from a BeQuiet DPP 650 PSU that is running a 4870x2 and a 4Ghz i7-920. Power draw from the 240 is minimal.
some 9600gso's had 96 sp. 9600gt had 64sp
Ah yes the GSO thats what i meant
