Asus P5N32-SLI Deluxe - Manual (Page 167)

A S U S P 5 N 3 2 - S L I D e l u x e A S U S P 5 N 3 2 - S L I D e l u x e A S U S P 5 N 3 2 - S L I D e l u x e A S U S P 5 N 3 2 - S L I D e l u x e A S U S P 5 N 3 2 - S L I D e l u x e 6 - 3 6 - 3 6 - 3 6 - 3 6 - 3
4. Insert the second graphics card into the other slot. Make sure that the
card is properly seated on the slot.
If required, connect an auxiliary power source to the PCI Express
graphics cards.
3. Insert one graphics card into either the blue or black slot. Make sure
that the card is properly seated on the slot.