[Tachyon]

Why 3 independent pumps.
Well two reasons .. first I wanted to have the coolest coolant available to each of the critical devices. Second - since water, like electricity, follows the path of least resistance, I did not want to give it a chance to favor one device over another for any reason. In a design where you have a header or "Y" adaptor there is nothing stopping some or all the coolant from flowing down a single path.

Speaking of water blocks....
I'm really liking the design and results I'm seeing on the new D-Tek Fusion for the CPU. On the GPU's probably going to be danger den unit (when available) NB & SB ..hmm hadn't really decided .. they're not really that critical.

....sizing down the tubing....
Here is my thinking here - you have 2 or in my case 3, 3/8 coolant lines each with a fixed flow rate. It's pulling out of the cool supply rez - thur the loops to the warm rez tank. Now - what size tube/s would you use for the lines going from the warm tank to the cool tank via what ever I use to remove the thermal energy with. Answer: in my case 3 loops x 3/8" (9/8ths or 1 1/8th) or I'm ok to round down to 1" with the understanding that there is going to be a slight flow increase in those lines. In a single loop system where you have 1/2” or 3/8” tubing throughout it’s a none issue since you’re minding the conservation of additive flow rates. (there are none to add!) But in a multi-looped system or one where you’ve divided the flow some how … I would think that to be efficient you’d need to mind those additive flow rates. What I do not understand is when people take a 1/2" supply line and divide it into two 1/2" lines via a "Y" (or worse yet a "T"). From a total flow volume and rate stand point this would seem to be problematic or at the very least inefficient. A 1/2” input to two 1/4” outputs “Y” adaptor is what I’m talking about here for example. Am I way off here or is this just not an issue? Has this been tested before?

...you are considering a chiller rather than a radiator...
Well I've got some ideas there that I'm not done messing with in my brain yet. But I've just read about the Switftech chiller with it's performance levels and it looks interesting.
Ever notice how your basement floor is always cold .... mine is .... and it's < 8' below me... Why not place a radiator/fan down on the basement floor to utilize the lack of thermal energy to remove some from my system. In a sealed system pump heads are irrelevant (theoretically) The pump is just acting as a recirculation pump. In this scenario anything could be used as it’s “in the basement”. Like a full sized automotive radiator with a real 12vdc fan on it .. ok way over kill …. But you get my drift. You could use say a automatic trans-cooler with integral cooling fan quite nicely.

Tach -