Are you overcloking? what do you mean boot loops? does it not post? please be descriptive as there are no know boot loops. only time a board will loop is for a few things. Bclk training is what allows 110+ base clock on air it requires many loops depending on your CPU and BIOS. ud3h for instance wont loop when you set bclk but its also limited to 103-5 like the majority of other boards. When i say bclk I don't mean the dividers.
please try to als enable single bios mode switch i always use it to disable dual bios. also on a cold boot it is okay for the board to try multiple times to start when its overclocked, however if. it doesnt start then your oc isnt good.