Well, it's simple really: the waterblock benefits from a higher flow rate, as it keeps the block as close to the water temp as possible.
The rad benefits from a lower flow rate, because the longer the hot water is in the rad, the longer it can be cooled.
So if you run your rads in parallel, then you've just reduced your flow rate by half, for each rad, therefore improving the cooling.
...BUT...
because you're using rads in parallel, there is a little bit less resistance to waterflow, so your overall flow rate will increase, just a little bit, but that's ok, because it's still 50-50% for the rads, plus the waterblock likes it. It's overall better, any way you look at it.
Ca c'est sur!
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