[Gooserider]

I would point out that it isn't strictly necessary to have the NB and GPU blocks be identical flow resistance - in fact it might be good if they aren't! My understanding is that the NB is relatively low heat output compared to the GPU, so it might be a more effective setup to have the NB block be more restrictive than the GPU block. The NB doesn't need as much cooling, so why waste the coolant on that, when you need it more over on the GPU. Look at BR's setup, note how he has several blocks on the NB branch, but actually uses two branches for the graphics card.

Also BR mentioned this in passing, but I would emphasize more, you need to think more about your tubing sizes. The 1/2" in is good, but the two 1/4" outs would be way restrictive as they have much less area than the 1/2" inlet. You should use 3/8" hose for the outlets as 2 x 3/8" is much closer to 1/2" in volume capacity than 2 x 1/4" Figure the cross section area of each tube and you'll see what I mean! 1/2" = 0.2"^2, 3/8" = 0.11"^2, and 1/4" = 0.05"^2, so you'd need FOUR 1/4" outlets to get the same cross section as a 1/2" tube. It's actually even worse than this since the flow resistance of smaller tubes is greater due to the increased wall surface area.