Ive read that before, i understand what you are saying, regardless a single 1/2" modded ddc is better than a D5. And despite the small difference in temp 2 1/2" modded ddcs are a (relatively) good value if youre looking for highest performance. Two would have similar heat dump to a D5 but much, much higher head. Also, the results are using older blocks, cpu's etc. Newer blocks with newer hotter procs, and newer better rads, would produce a larger delta, a loop with multiple blocks would as well. I agree with you on the value front (on a single block loop) one pump is sufficient.
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