Me and my friend have ordered total new water cooling systems from DD and we use this Pump.
This Block really does its job well. I have the MC-TDX CPU Block and a water cooled motherboard and then the GPU and it works excellent!
My Q9450 CPU runs in 3,2Ghz 40c temp, and the 9800GX2 runs whit 20% Overclock 60C on the GPU.
We use ½ inch DD high flow fittings and Tygon / UV tubings.
We cool Q9450 CPU (MC-TDX Block) and 9800gx2 (DD-9800gx2 Block) graphic card whit ASUS Striker II Extreme (water cooled) motherboard, and it cools great with the DD12V-D5 Pump!