I have one, and it does make a lot of difference.

People make a big deal about the fact that they can play the CellFactor tech demo in software PhysX mode. Well, it's not a big secret that Ageia made both a hardware and software physics platform.

If you run CellFactor tech demo without the PhysX hardware, it is dramatically slower, regardless of what anybody else says. There is no way you will get any more than 2fps if you're not running PhysX hardware with liquid and cloth simulation enabled, it just [b]does not work[/b]!!

RealityMark is a piece of software developed by Ageia using the Reality Engine. It shows off some cool gameplay action in CellFactor with loads of cloth and liquid effects. See the screenshot below to see exactly how much difference the PhysX card makes.

http://i14.photobucket.com/albums/a324/ ... 6db86e.jpg

Yeah, my complaint with them is that there aren't many games for them.

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...

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... and I don't have one.

More games being added to this list all the time though
http://www.ageia.com/physx/titles.html

Hmm, yeah, still not many, though, and the current ones don't actually do much with the physx, I guess.