maybe i'm a little late on this, but why use 2 pumps? it just seems more complicated. you're using basically a chiller, correct? so, why not this:
res-->pump-->chiller(cold)-->cpu-->chiller(hot)-->rad-->res
or even
res-->pump-->cpu-->chiller(hot)-->rad-->chiller(cold)-->res
make sense?
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:shrug:
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