Good show, Sevisehda.
Most pumps are used at the far end of the curve, but it's different for everyone. The average frow rate for a typical rig is ~60 gph.
With blocks in CPU you still want most of the flow to go through the CPU block, and that means throttling the flow to other blocks. By doing so, the total pressure should end up being slightly less than if the CPU block was by itself, which will result in a bit more flow, but still split.
Blocks in series put the pump further out of their energy efficiency range: gph for head, you end up loosing further than you already have.
I ran the calcs once for LiquidRulez, for pressure drops of a nozzle, and found that the rad/heatercore alone will create a significant pressure drop, throwing anything else way up on the curve.
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