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Originally Posted by Dave
From your charts, it suggest only a 0.5-0.8 DegC difference in true CPU temps from one to two pumps, if I read correct, Stew?
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Yeah, around about that. A ~0.5C improvement would be a reasonable bet. Depends on the CPU heat load really, as well as the size of the CPU die itself. Smaller dies will yield larger improvements. I'd say a 0.2-1.0C sort of improvement range.
Robotech was nice enough to generate a performance vs pumping power graph:
Click here for source of graph.
The MAG is a ~1W applied-to-the-waterblock sort of powered pump for purposes of that graph. Putting 2 in series would probably get you about 1.75-2.0W applied pumping power (after factoring in power loss due to other components).
As you can see from that graph, the Storm doesn't need a particularly powerful pump to do its thing.