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With a hundred watt CPU that means the second CPU gets heated all of .15C hotter then the first!
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OK Redleader, that makes sense, so It sounds like series it is, as I certainly am not going to worry about less than a quarter degree temp difference between CPU's.
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Aren't manifolds bad for pressure drop? (in this situation as described)
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I'm not sure Murray13, they are probably bad, but I don't know just how much harm what I have in mind would do.
My design would really have just two diameter changes per manifold. The one that splits the flow will have one big increase in diameter as it enters the manifold, and then a restriction on exit as it goes back down to the tube ID for that circuit. The one that recombines the flows would do the reverse.
My intent with the manifolds was twofold. One was to split the flow into different circuits, and the other was to use it to reduce the diameter of the radiator lines (probably 3/4" or 7/8" judging by most of the heater core specs I've seen) to the diameter of the circuit lines.
I still think I need two cooling loops, as I don't think the NB or drives need 1/2" plumbing or flow levels; nor do I want to try to get 1/2" into the drive bays. Also if I was to try to make drive cooling plates with 1/2" passages I'd end up with plates that were bigger than the drives
I have trouble thinking a manifold splitter would be more restrictive than adding a lengthy loop of 1/4" plumbing in series with the 1/2" CPU plumbing.
Of course, the arguement that says I should put the CPU's in series would also apply to my NB and drives, suggesting that I really only need to have two circuits, one 1/2" loop for the CPU's and a 1/4" loop for the other stuff. Manifolds seem a bit of an overkill approach for so few splits, so I might end up going with "T" or "Y" fittings instead. How would the restriction from those compare to what a manifold would produce?
Even more to the bottom line, If I go with a good high flow pump (say an Eheim 1048 or 1250) how much would I need to care? If I can get say 1-2 GPM flow through the system, does it REALLY matter?
Alternatively, given the list of things to cool I mentioned in my first post (2 CPU's, 1 NB, 3 drives) what would you do to plumb it?
Gooserider