Not an endorsement, but I just put together a Q6600 machine and used an Asus P5N-E. Quick specs- Q6600 B3 stepping, P5N-E, 4 GB OCZ 800 DDR2, Sonata III case, 400GB 7200.10 & 320GB 7200.10 HDs, MSI 8600GT DDR3 256MB I planned to OC mine, but with stock cooling it runs quite hot. For instance, ri...