i had the ud3r for 2 weeks and it worked great with q9450. had great oc option.
you should look in to EP45C-UD3R. it has 2x DDR3 slots and works great with patriot ddr3 1600 mem stick. build one for a client and he loves it. oc like a champ... oc his q9550 to 3.6ghz w/o any problem. hooked it up with gtx295 and kills all the games @ 1680 x 1050(22" monitor).