Robin Hoods Playground

What is the best crossfireX motherboard and processor? I'm going to get the Sapphire Radeon HD 5870. What is the best motherboard and processor for this video card?
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How do I check and see what kind of motherboard and what model am I using? I just reformatted my computer and I'm not getting any sounds. I get a yellow error sign in device manager next to the C-Media AC97 Audio device. I've tried everything from updating from microsoft to using the K lite codec. N...