8800 Ultra and 8400gs 2 CARDS ON BOARD


I will be glad to get info about the option of using both cards on the mother board.
I have ASUS SLI deluxe mother board with 2 pci-e slots. I’m currently using 8800 Ultra both for computing and display.

Can i use both on the motherb board, use 8400 for display, and 8800 for cuda computing?
If it is possible, what i need to do?

Please advise,