Ok. So I finally went home and tried it myself.
GPUZ is showing me all three, now, earlier it showed only the SLI cards.
when I change the cards under the GPUZ tab it shows SLI Enabled for the 9600's but no PhysX only CUDA Direct Compute.
When I change the tab from 9600's to 780a then is shows SLI disabled and PhysX on.
So I have a feeling it will work, but I need to try out GRAW again to be sure.
The Nvidia CP is giving me the markers for PhysX and SLI.
Let's see what happens, I'll repost the data again here later this evening.