also, if the two blocks are not equally restrictive (though they probably will always be slightly so, due to the fact that the tubing on each line will be of different lengths) different amounts of liquid will flow through each- more on the least restrictive- approximated Kirchoff's voltage law
I say design both gpu and nb blocks identically and follow your plan of splitting the flow outside the cpu block (don't use 1/4", as it only adds restriction) with a Y fitting
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