The aluminum fins on this tower heatsink are 0.2mm thick, allowing air to easily pass through the fin stack and consequently keep noise levels in check. The single 140mm PWM fan on the Igloo H58 heatsink rocks out at 1400 RPM full blast, just 700 RPM when dialed back to its most conservative speed. Noise levels flutter between 46.4-31.0 dBA according to Frostytech's real world sound measurements - ie. it's nice and quiet. [FROSTYTECH] via [Frostytech.com]