While EVGA has had a CO-OP line of video cards for a while now, their latest edition to the dual GPU lineup is something a bit unique.  Instead of allowing SLI on a single card like most of the other co-op cards, the GTX 275 CO-OP uses a GTX 275 GPU for graphics and a GTS 250 GPU for PhysX support.  PhysX allows the GPU to do advance physics processing and effects.

The advantage of this in this case, is it allows EVGA to make a cheaper card with PhysX support, and not force people to get a much more expensive full dual GPU card.  Still at $350 it's no small chunk of change.  I vote they bundle in a solid co-op game with PhysX support like Sacred 2: Fallen Angel.