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Originally Posted by Cathar
I would say that a RD-20 is perhaps a better choice than the RD-30.
The RD-30 is nice, but it is somewhat over-powered and hot (has too large of a heat dump) for anything short of a tri-fan radiator to deal with.
The RD-20 is a much better balanced pump as far as water-cooling use is concerned.
I have the 24v RD-30 here, and I get my best temps with the RD30 when it is run at 17-19v, rather than at its full 24v, and I have a 24x30cm radiator cooling the water (although with two quiet fans).
Internally the RD-20 is indentical to the RD-30, and the RD-20 @ 24v runs pretty much like an RD-30 @ 20v.
So again, the RD-20 is the better balanced pump to be targetting here, and not the RD-30.
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Cathar, in this case maybe an RD-20 24vdc could be rewound to run off of 12vdc with the same output. Thus allowing it to run off of a good PSU?