Originally Posted by colin-java
I notice you're looking at the DDC 3.2 pump.
I don't really know anything about this pump, but I think most professional watercoolers (and myself) go for the D5 pump.
Its more powerful, probably quieter and cooler too. And you can vary the speed of it at the back, which is useful for bleeding the air out.
I made the decision to go with the DDC 3.2 because of the charts on EKWBs site for the item;
That clearly shows considerably better performance from the DDC 3.2 over the D5. At 300mbar of pressure the DDC3.2 is pushing 320 L/h, while the D5 is only pushing 200.