External Water Cooling Design For 2 PCs

Falcore

Honorable
Jan 16, 2014
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10,510
I'm currently looping to water cool 2 PCs, both identical R9 290 GPU and I4670. There isn't enough space in the phantom 410 cases for the radiators necessary to cool everything without permanent modifications. I've come up with two possible loops for cooling but would like some second opinions and help picking out parts. I figured I should also mention that there is virtually no desk space to work with and I plan on stowing the radiator/res/pumps on a shelf that sits between the two desks.


The idea behind both designs is to get away with one large radiator which will allow me to scale my systems over the next few years and also save space while still looking aesthetically appealing.

Design 1: https://docs.google.com/drawings/d/1iOLnR9sMYJ7UvXdt0vzrAjhVedE1LJrL89Id1F-kerw/edit?usp=sharing

This incorporates 2 separate loops with a single radiator and reservoir, with this design I can isolate and drain each loop as necessary for changes or to move the system. However I am not sure if I will achieve sufficient flow through the radiator being at the suction of the pump. Likewise though during normal 2 PC load that means 2 pumps pulling suction therefor more flow.

Design 2: https://docs.google.com/drawings/d/1mLDZ6iCx3IENp6OrAQIZCi_sD5Aovb2nyR6ZINV6DWQ/edit?usp=sharing

Still 2 separate loops, single radiator, and reservoir, with this one though the radiator has been moved to the very last component and is going to discharge to the reservoir. This design makes me nervous with the discharge of two pumps going into the single radiator I don't want to run into potential dead heading of the pumps, causing premature pump failure, or over pressurizing the radiator causing a leak.