Entropyon :
The rig is built but I have not bought the graphics cards yet. If the asus ones won't fit ( if I understand mosox correctly they will take up 3 slots each) which good 2gb 6950 fill take up two slots.
Btw I see you guys are all steering away from the 6990.
Hi, I am not an expert in building computers so take this with a grain of salt. Every review of the Asus Pro V board that I have read has said it is easily capable of two-way crossfire and there are two open slots between the two 8x PCI-E slots you would use for crossfire. That is why I don't understand the original comment that two 6950s of any make will not fit. I don't believe they take up three slots each. Again, I could be wrong as I am new to building computers. By simple logic, looking at the pictures of the board shows plenty of room for two Asus 6950s, but I have not built on that board.
The 6990 is not a great card - it is noisy and expensive. Two 6970s outperform it and cost about the same. They use less power and are quieter.