[BillA]

a PA120.3 is 2 row rad (having higher airflow resistance than a single row)
a high speed fan at lower volts will not do as well as a fan designed for the lower speed;
if you are seeking also the better performance that a dual row offers then a higher speed is required
- how much additional speed is also affected by the fan thickness (thicker = lower RPM for similar performance = lower noise)

for testing 2 row rads I am now using the Panaflo FBA12G12M for performance (at 'reasonable' noise), and the Nexos D12SL-12 for low noise (at 'low' performance)
- not that these are the very best, they are available and well known which is good for testing