Thanks for reply.
The plug is as the second one you described, pin, pin, blank, pin (
shown in installation guide)
Guess it will work on the motherboard, if I care to deal with it.
Water Block:
Bitspower MOS For MSI X299M Gaming Pro Carbon
Motherboard:
MSI X299M GAMING PRO CARBON AC
Edit: Looking at the motherboard manual, the RGB LED port is 12v, R, G, B.
Since the block is made for the board, I must assume it should work?
I will try it on the farbwerk, I would rather blow it up than the motherboard.