uD9 is more of a bench board...R3E is a bench board IMO aswell...though i have the R3E and its running great...just one down side is it doesnt have dual lan...which comes in handy some times...as for UD9...if ur gonna use the rig just for gaming and everyday use, UD9 aint ur choice...7 pcie slots, nforce, $700...most of the time ur onli gonna use like 400$ of the value...maybe u can go for rampage 3 formula instead of extreme....formula should be a little chepaer