Yeah, as paulerxx said, I used my old GTX 260 Core 216 card with those two titles and I really liked it... but after that... I always found PhysX particles and such a waste and too much of a performance hog.
I even tried using the GTX 260 as a PhysX card with my GTX 580, and the results were inconsistent like SLI. Sometimes it was faster with two cards, sometimes it disrupted the frame pacing, sometimes it was just slower.
But now, I don't think any one uses it for GPU accelerated physics, in games at least.
Now, it seems, it's just an SDK/ API for physics like Havok...
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