all current 790FX are have the sb600 which can cause idle errors on phenom's, but not on X2's or semprons.
if he just need 4 pci express slots there was an intel board with 4 pci express slots MSI P6N Diamond LGA 775 NVIDIA nForce 680i SLI ATX Intel Motherboard
if it doesn't matter that he dosen't want or will use SLI he could 4 9800GX2 on that board.
it's been done on an intel board.
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