No minimum FPS, shame on all of them. Only elitebastards got it right to some extent.
"There's no doubt that, at the end of the day, accelerating PhysX effects to any real degree via the GPU is far, far more effective than using the CPU, and indeed far better that AGEIA's own Physics Processing Unit which often got a lot of flak for its own lacklustre performance. Of course, that isn't to say that the situation is perfect, and even the high-end parts we used for our testing struggled at times, in Unreal Tournament 3 in particular. Indeed, in scenarios where a lot of physics effects and debris are being thrown around, you could argue a kind of chicken and egg effect - Physics processing on the GPU takes resources away from 3D rendering, but those physics effects create debris and the like and thus a lot more objects on screen, which requires more 3D rendering horsepower, which is being taken up by physics processing, and so on."
I foresee that during physx intensive moments you will get horrible minimum framerates, when using a single videocard for both 3d acceleration AND physx. Look at keysplayer his benchmark for example, using a 9800gtx+, his minimum framerates with edge detect and 8xAF @ 1280*1024 still suck when using Physx, I bet those minimum framerates are during physx intensive moments.
Elitebastards also noted, that if radeon cards can't run them, it's a big gamble to make games that actually REQUIRE special hardware ( nvidia gpu's in this case ) to run properly, because you loose all the AMD card owners who can't play those games.
Things I did like is a new form of SLI where you can run your old nvidia card alongside your new nvidia card, and have the old card do the physx part. You can see in one sites benchmarks that the 8800gts 640mb still got some pretty good framerates, and it might actually be sufficient for most physx games. No SLI board is needed, BIG plus, the fact that you do need a second monitor in Vista kind of sucks though ... And, of course it eats power, so you will need a SLI capable PSU. BIG QUESTION IS, can you run a nvidia videocard, alongside a AMD videocard, and have the AMD card do the 3d acceleration, and have the Nvidia card do the physx !?