I have the Ud4, my 12v cpu from psu is just two 4's joined to form an 8.
FYI (and all other UD4 users) p24 of the manual states "When you overclock the CPU, make sure to connect one end of the included 1 to 3 power cable to the ATX_12V_2*4 power connector and the other three to the power supply to ensure the system is provided with enough power"
I hadn't come across one of these 1 to 3 power cable's before which is why I asked. It may well not be necessary just putting it here for feedback , experience reasons (and also to prove to myself I didn't imagine it )
I haven't used it yet, but Im also not going to be pushing my setup until I get a CPU water cooler at the end of the month (and hopefully some longer 2*4 / 8 pin cables).