[bobkoure]

from this thread at silentpcreview

Originally Posted by snutten

If you want Procooling numbers on why parallell loops are the better choice, read Cathar's article on pumps and flow.

Heck, I thought I knew a little bit about watercooling for low-noise. Clearly I still have a lot to learn.

Now, based on this thread here at ProCooling

Originally Posted by Cathar

Eheim 1046, WB delta = 100W * 0.187C/W = 18.7C, Water delta = (100 + 1.5)W * 0.045C/W = 4.6C, Total CPU temperature = 23.3C above ambient

I'd guess that a 1046 should be fine for someone looking for as-quiet-as-possible and temps just below the CPU mfgr's specified max.

However, I have to wonder what happens to the waterblock C/W when the rate is reduced by running in parallel loops.
I realize that the flow isn't reduced by half, first as the resistance isn't the same in both sides and the lower-resistance side will "steal" flow, and second, actual total flow should go up as total system resistance is reduced.
Anyway, just supposing for a moment that these two factors cancel out and the flow is simply halved, how would a un-flow-hungry block, like the 6000 do with, say, 1.6 LPM? That's not lots less than the half-gallon a minute I've always thought of as a bare minimum, so maybe it's fine? Actually, given the restriction difference between the Cascade and the 6000, maybe he actually will see a half GPM.

I'd already questioned a parallel setup in that thread and am now trying to figure out if I'm wrong.