Does anyone know if I can crossfire Asus 5850 DirectCu's on the GA-X58A-UD3R? I have the first one in my top PCI 16x slot, and it looks like it would be an iffy fit to get another one in the middle slot (the top of the second card would have like a millimeter or two of clearance from the fan on the bottom of the card I have in there now), but I am also reasonably sure that a second one won't fit in the 3rd slot. I want to throw another card in there but I am hesitant to purchase one if it might not fit. Any help would be appreciated.