LatiosXT, can you point us to a reference and justification for the claim that a loop shouldn't have more than one rad?
I'm curious because I'm building my first custom loop for a system that has 4 waterblocks, and in my research found some posts
that state the opposite, or are inconclusive. As you suggest, the focus has been mostly on the most effective number of 120mm rads (...120, 240, 360, or 480 models) necessary for cooling performance. This video by DadMode
address the question of how much benefit is gained by adding additional radiator beyond the usually recommended 1 120mm rad per cpu or gpu waterblock.