Originally Posted by Rollo
Which doesn't really matter at all because it's just captured game play. ATi owners can't turn on the effects that make the NVIDIA version look so much better.
A few years back when Havok and Ageia were up for sale, ATi didn't have any money to buy them so they left current day ATi owners out in the cold for accelerated physics effects.
Which means the games (or tech demos) shown simply don't render any effects without PhysX capable hardware, not that it cannot be done without PhysX. Especially Havok has shown that much of this can be done without any hardware support (of course, anything can be done in software).
This list of PhysX supporting games (though it may not be complete, but it even includes PS3 exclusives like Heavy Rain and titles which aren't even released yet) shows how relevant PhysX really is and how interested game developers are in limiting the full game experience to just a part of their customers:
This also includes titles like Cryostasis which was a total ressource hog and almost implayable on any system.