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With a pump that large may I suggest you consider creation of a dual loop water rig. By spliting that pumps flow in half with one half going to the CPU block & the second half going to the GPU/NB you'd reduce your system resistence a great deal. Example
Monster pump=>dual parralel 2-342 cores=>
core "A" outlet => CPU block => single shared RES
core "B" outlet to GPU & NB blocks => single shared RES
Single RES =>pump inlet
A dual loop of this sort would have only approx. 30-35% of the resistence/headloss as compared to if you ran it all cores and blocks in series. Depending on the blocks you choose this dual loop might run anywhere from 3.5gpm to 4.5gpm. Sad fact is that pump is just plain driving more flow than even a dual looped water rig can well use.
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Why split it though? Sure it reduces overall pressure drop, but it also decreases the pressure available to cool the block, not to mention flow balanceing issues.
I'm curious why you prefer this. Is pressure so great in both cases the the difference in flow is negligable? I'm afraid that maybe my common sense doesn't apply to pumps that large.