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 a MC-TDX CPU Block and the water cooled motherboard before I cool the GPU and it works excellent!
My Q9450 CPU runs in 3,2Ghz and the 9800GX2 runs whit 20% Overclock whit 60C as result 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!