I understand what you are attempting to do (Imagine that, me understanding anything ) The real flaw in your plan is not the set up but the fact that water temp only varies by a few degrees at best.
In order for the exchanger to be of any real benifit the water would have to be (a guess) 30 degrees or better different. NO PC or combination of blocks as of now are capable of introducing that much heat into the water. By building separate loops you might get .5 degree differance in CPU temp ( again a guess ) and the real question is do you want to spend another 200 bucks to get that .5 degree temp diff?
PC rads work on a low temp diff. once you get within a couple degrees of ambiant, it would take a rad the size of a wall and a few hundred fans to get temp to drop any lower. What I am trying to say is it dont take much to reach the point of diminishing returns with straight water cooling.
I know I didnt explan it very well but maybe the higher educated around here can put it into correct context.
Aardil
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