Okay, here's where I'm coming from.
Let's assume:
An Eheim 1046 (5lpm/4' head height pump) or equivalent
2 x Black Ice Micro's in series (assume that pressure drop is about the same as a 4-pass Black Ice Classic)
and
1) White Water
or
2) MCW5000A
Let's say that at 5lpm that the pump's fittings and system tubing has a total pressure drop of 0.2mH2O, which is probably pretty close given 3/8" pump fittings and tubing.
At 5lpm, the radiators have a pressure drop of 2.0mH2O
At 5lpm, the WW has a pressure drop of about 0.8mH2O
At 5lpm, the MCW5000A has a PD of 0.25mH2O
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So total PD for WW system at 5lpm is 3.0mH2O
Total PD for MCW5000A system is 2.45mH2O
The radiators are the dominant part of this equation.
For the WW setup we're looking at about 2.6lpm
For the MCW5000A setup we're looking at about 2.8lpm
ie. At this level any particular waterblock's resistance is not really a major factor to contend with.
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If we stuck the radiators in parallel then at 5lpm we'd have 0.5mH2O PD through them.
Total for PD for WW system is then 1.5mH2O
Total PD for MCW5000A system is then 0.95mH2O
Predicted flow rate for WW is ~3.2lpm
For MCW5000A is ~3.5lpm
Now take a look at the cooling performance for both blocks at those flow rates and whether or not the waterblock is going have a significant impact on the flowrates to tip radiator performance "over the edge".
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