Z68 + Nvidia + Dual Monitors

I'm looking to upgrade to a Z68 platform, and am wondering what happens when...

I'm currently using a GTX470 with one monitor and a passive GT240 with another monitor (so that the GTX actually reaches idle clocks and cools down when not gaming, and is hence not really noisy).

So when I go to Z68 + 2500K could I use the GTX470 in d-mode for gaming and have the second monitor off the iGPU? or would the nvidia drivers complain, would PhysX break? what would happen? Or would I have to use two cards again.

Thanks.