Airflow obviously has an impact on the heat dissipated by a rad. No one can give a logical argument otherwise (though the imperical data above is a stickler). Water flow rates will have almost no effect on heat dissipated. Find the article about water cooling myths on this site (it's under "articles" on the front page). There you will find an excellent explanation as to why flow rate through a rad doesn't change heat dissipation. Flow rates can have a large effect on your waterblocks performance. You said that you were going to throw a tdx in the loop so you will want to achieve all the flow your loop can muster. From this standpoint I still say run your rads in series.
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