I didn't think the split itself would matter much since the "Y" fitting would be within a couple of inches of the pump output fitting. At that point, it seems the velocity of the water wouldn't have been reduced too much, so the effect of splitting the flow in half and running each leg over one chip would actually result in a more effective cooling solution.
Would a beefier pump (say an Aqua 2600 rated at 740 gph) pretty much solve that issue?
I wonder if any of the waterblock manufacturers consider matched resistance an important factor in the design of their water blocks. How do you measure the resistance of a waterblock? I imagine that resistance on a given leg of a parallel system could be tuned to a certain point so that all parallel legs have a reasonably similar value.
I didn't mention it, but I am planning on using 1/2-inch fittings on all of the components.
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