No, I don't think there would be multi pass water through the rad. Well, some of the water moecules may multi pass, but the heat wouldn't. The thought was to use a low pressure pump on a low restriction rad, and a high pressure pump on high restriction (high efficiency) blocks. As for your second picture, I don't like running two pumps of diferent flows and pressures in series. Wouldn't they cancel each other out, lower pressure for the high pressure pump and lower flow for the low pressure pump?
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