if you are thinking about cooling 2 CPUs and a video card then I hope you are thinking about using more than one BI Micro. If using 2 then you can get 1/2" Y splitters and run them in parallel. 3/8" Tygon should go over the 1/2" Y barbs, especially if you put the end of hose in near boiling water. Then you can use 1/2" hose except for the small runs from radiators to Y. Since this run is in parallel then it isn't as big of a flow rate killer.
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