Originally Posted by Whalemeal
As far as I know, Scythe Gentle Typhoon is the best radiator fan.
Very far from the truth, if you're talking all 120mm x 120mm fans of all thicknesses. The amount of people that believe this amazes me more all the time. Even if you're only narrowing it down to 25mm-thick fans, they're still not the best rad fan. GTs just have the best noise profile relative to their CFM; actual produced static pressure is unimpressive compared to S-Flexes, ZM-F3s, Yates, even Noctua NF-F12s (despite most other Noctua fans being as unimpressive as GTs); you want static pressure out of a fan for rads, not raw CFM. The noise profile of those fans may not be exactly as good as GTs but they do perform better and can sound nearly as good. Going into 38mm-thick territory, pretty much everything beats GTs in every respect on every radiator, it's not even really fair to compare at that point, especially if the fans are intended for use on thick/high-FPI rads.
PG; if you can fit 38mm-thick fans to the rad, you should take it into consideration. Fans in that category may be overkill, but only if really run at full speed. Undervolted to the same speeds, most 38mm-thick fans will toast every 25mm-thick fan out there in terms of noise, noise profile, static pressure, power draw, CFM.... well, everything, as I said.