BillA's Thermochill article and Cathar's PA160 testing show that radiator efficiency is very high. We're talking about something like 95%, which means that getting significantly better performance requires more airflow, regardless of radiator size. And that leads to the PA160's design focus: as little airflow resistance as possible in a reasonably compact size. The 120.3's larger frontal area might allow a bit more airflow (though I'm not convinced this is so) but probably not enough to deliver even 1C.
Cathar?
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