El Tigre said:
As the others said, Nvidia's hardware does not allow hybrid multi-card configurations. You can have Quad SLI with 2 GTX 690's or use a single GTX 690 and use the GTX 680 as a dedicated PhysX card. This kind of setup is overkill though when many consider my GTX 560 Ti to be overkill for PhysX duty.
not entirely true.
hybrid PhysX is real and using a HD Radeon GPU with nVidia GPU (PhysX) is very common.
just takes certified 'hacked' drivers.
so the 'hybrid' term in this case is incorrect and needs to be strictly about nVidia PGU's.