Im running a ud3 which is the same board minus some features. Play with it. Im currently at 1.4v set in bios (vDrop to 1.368v) with 1.18v VTT, manually set my ram, 100x47. Sometimes the easy settings are the ones that dont work.
Try multiple multipliers as well. My board doesnt really care for the 45x multi much. Loves the 46x, but I got it stable at 47x.