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Originally Posted by DDogg
Yes, please, and although I'm no pro at this, I not so sure it is negligible. Clearly, the pump I used perhaps doubled my flow, yet increased temps in the ground loop. When I went back to my smaller pump, the GL temp returned to what it had been. Perhaps there is another explanation. I thought at first the increased flow was better scavenging the heat, but the CPU temp also went up so that could not be it. Comments?
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Radiators are generally well over speced verses waterblocks simply because makeing a big, powerful radiator costs almost nothing (heatercore). Conversely extracting extra performance from a block is very hard because you are limited by the size of the die.
Furthermore relatively little energy is added by the pump. 10 or 20 watts means very little when a CPU is putting out 100, and a GPU 60.
Combine the excess radiator capacity with low heat input, and the result is generally a negligable change in temps in all but the most extreme cases.