IMHO, the idea saton472 proposed is a bad one, reliability-wise. Again, if one pump goes out, you have a situation where the dead pump loop becomes a large bypass (least resistance). The only way to make it work is if there is only one loop intersection, not a loop in a loop. This would cause failure of both cooled components rapidly.
As far as putting the blocks in series or in parallel, we are not just looking at the effect of the blocks on the coolant, but the radiator as well. Granted, this will not make a massive change, but will be a minor change for the better.
Since there is one rad that is going to running a high heat load, odds are the water will be warmer than we are used to relative to ambient. Any way that we can reduce the temperature of the coolant to the blocks would be good. In this case it would mean parallel block loops. Again, we are probably talking on the order of 3-4 degrees C, but every bit helps, especially when you are going to the lengths of using pelts to lower temps. Why waste part of your advantage? Especially considering that it will add no extra complexity to the design besides two "T" splitters.
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#!/bin/sh {who;} {last;} {pause;} {grep;} {touch;} {unzip;} mount /dev/girl -t {wet;} {fsck;} {fsck;} {fsck;} {fsck;} echo yes yes yes {yes;} umount {/dev/girl;zip;} rm -rf {wet.spot;} {sleep;} finger: permission denied
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