If you dont have the 3 pin mobo header, then your pump is the 3.1? There is a mod that can be done to ramp up the pump to a 3.2 spec (solder mod) which makes it the same spec as the 3.2 (head pressure), afaik thats the only difference between the two, (that and the impeller is orange/white and not blue/orange) that and the mobo header.
The DDC-1T Pro or Ultra came with a blue impeller, the DDC-1+T was a red impeller and the DDC-2 orange. Avoid the DDC-2 since those are not reliable and were basically pull from retail and replaced with the Pro/Ultra.
NOTE: not all DDC-1T pumps can be mod'ed jumping the solder pads on the PCB. Two PCB boards exist; One with the old Philips IC (out of production) and another (recently used today) made in Italy.