Are you sure you want to do that?
ASUS KGPE-D16 SSI EEB 3.61- $425
AMD Opteron 6128 Magny-Cours- $250 (each)
Sure, you getting lots of cores, but they are 'slow' cores. For the cost of just the dual G34 board you could get a AM3/AM3+ board, and a 6-8 core Phenom II/Bulldozer. Or a similar intel setup.
BTW, GPU folding is worth looking at as well. Its possible that a PhenomII/Bulldozer or i7 quad with a nice video card will get you more points per day, with less power consumption.