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Originally Posted by Razor6
That doesn't seem to make sense, did they change their test conditions between the two?
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They've changed their website since I've last looked (so it may be lurking somewhere) but I don't see any mention of air volume moving through the radiator - and I don't believe the old site design had any mention of the delta between ambient air and coolant (general thinking here at proforums was that they were using 30C or maybe 40 - which is appropriate when spec'ing radiators for hydronic heating, but not for PC cooling, where IMHO 2C to 4C is more appropriate).
On the bright side, they seem to have also dropped all mention of coolant flow ( it seemed to imply that you need a large coolant flow for a radiator to perform - and actually doesn't mean much at all).
All that said, these two models appear to be of the same construction, so, at best*, a III should be able to dump half again as much heat as a single II.
I'd just choose based on frontal area - and what fit in my case.
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at best because radiator efficiency is directly proportional to the delta between ambient and coolant and as you get a larger radiator your coolant temp goes down (good) but this also means the radiator becomes less efficient.
Also
at best because as you add fans you (at least potentially) increase airflow - and airflow resistance in your case may become an issue.