While we've discussed various combinations of pumps and even various blocks arranged in parallel I haven't noticed any discussion of serial versus parallel radiators. This isn't to say it hasn't been addressed but I haven't seen it and a cursory search didn't yield any information (I'd actually be surprised if it isn't buried around here somewhere). If this is the case then assume I am lazy and kindly call me a dancing banana and direct me to the discussion or, as it never hurts to revisit our alleged science, discuss it.

The simple question is: Where would be be likely to see better thermal performance, two (identical) radiators in series or in (equal flow) parallel? Unless I miss my mark we'd see a significant falloff in performance of any rad(s) after the first (and I believe as much has been stated by one of our resident rocket scientists) in the series.

For parallel radiators it seems we'd see a more dramatic ΔT at each unit but I'm not sure how you'd handle the math for splitting flow prior to the radiators, applying ΔT, and then re-summing the flow, yada yada yada. Nor am I sure of the real world ramifications of such a configuration. Sometimes theory doesn't translate to practice, so I'm interested in praxis as well as theory.

For the sake of argument let's assume that all components are capable performers at their tasks, no wimpy 80mm rads (assume a pair of decent 120.2 or something) or excessive flow restriction or other such silliness. In fact, lets assume a simple CPU and GPU loop.

Intelligent thoughts?