Ok, this may sound dumb, but I have been reviewing and researching information on the P5W DH Deluxe by Asus. I've noticed that it has the PCI Express x 16 slot which is what the graphics card I have now is for (ATI X700 256mb). I've also noticed that the motherboard is set for Crossfire. Do I need a Crossfire card or will the original video card work for this board?