What Revision is your UD3? The UD3 has a good bios for OC'ing just follow the guides. Be sure you have the latest BIOS, Rev 3 is "FA" last time I checked. Getting your memory to 1866 may be a challenge with the UD3, anything over 1600 on mine causes stability issues. My 8350 runs at 4.6 24/7 @ 1.365v.
The memory speed is board related IMHO, my Corsair memory can run 1900+ in my CHVFZ board.