Anthony
I don't think we've tested that board specifically. It is a CUDA enabled board (Version 1.0) and might work, but probably will not give you as much performance for CUDA rendering.
Keep in mind ideally you'd have a two (at least) graphics card setup, one to run the GUI and the other to do the CUDA rendering.
So you can supplement your current setup by using the 5600 board as a GUI board (not needed for processing) and adding a 580/680 board for CUDA processing. This would be fairly inexpensive to do as well and certainly cheaper than buying anothe quadro board.
I hope that helps.