Excellent data HES. I appreciate the work you did that will help me and many others. I've been delaying personal upgrades to my watercooling builds, waiting for the continuation of your first testing and it was worth the wait. I'm personally not surprised by the results though. I had a feeling that stacking was just way too good to be true and that if it was significantly productive or even equivalent in performance to a non-sandwiched radiator without the sacrafice of comfortable noise levels, that manufacturers would have came up with their own design schemes much earlier. But the confirmation from this testing was needed.

I also would be eager to see results with higher performance fans, although I would not be interested at that point being that silence is as important to me as performance. Now if a sandwiched 120 rad with SLIGHTLY louder fans was SIGNIFICANTLY better performing than a 220 radiator with more queit fans than the sandwich would be very helpful to those who perfer smaller cases such as myself. But if the sandwiched 120 is louder and only 2 degrees better than the 220, then I'll find a way to make that 220 fit If I feel I truly need the extra radiator to begin with.

It's unfortunate that the lack of innovation in the CPU fan industry so greatly, directly effects advancement in the watercooling industry. Maybe if we all boycott the fan companies until they come up with something new, maybe then they'll laugh hysterically and tell us all to go #$%^ ourselves?? lol