Calculating the pressure drop of two CPU blocks in parallel seems rather pointless to me.
The actual application would be composed of a CPU block, and a GPU and/or NB block, both of which should be far less restrictive, which dictates the use of a valve. I'll admit however, that the GPU and NB should be in series.
As I said, this also requires taking a look at the pump, because the "rule of thumb" isn't always right. Would like to see the same graphs with an Eheim 1250, which is more typical, and in line with the kinds of pumps that most water coolers use.
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