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Originally Posted by fhorst
As I said... If your CPU block is restrictive, and your GPU/NB is not.... what will that do to the flow (and pressure gradient) in the CPU block?
You are right about "pressure gradient" (I guess, I'm not native speaking English)
For mee its all the same. The force that you need tho push the water through the tubes, rad and waterblocks 
If you split the hose, this force will be split also. This force is needed to create a good jet. A better jet will give better temps! |
Each component in the system will have a characteristic relationship between the flow rate and head loss. If your CPU block is the most restrictive thing in the loop then it may dominate the pressure drop of the system, but the NB block will also contribute. Note that for a given flow rate the pressure drop of the CPU block (any restriction actually) has only one value... it does not depend on the other components of the system.
If you have multiple paths you are not really splitting the pressure gradient. As I said before, this will be the same for all paths, assuming they split from and rejoin with each other in the same places. Obviously what is split is the flow rate of the fluid.