The SP120 High Performance Edition, at full RPM, has outstanding static pressure, up to 3; 1mm/H2O, when used on a radiator or heatsink * 4-PIN PWM Support for increased fan speed control * Seven wide body, low-pitch custom blades for optimal static pressure at very low noise levels * Custom fan enclosure for ducting air in the right direction with minimal interference * Advanced Hydraulic Bearing for reliable, quiet operation * Available in single or twin packs * Rubberized corners for sound damping when installed with standard screws * User-replaceable colored rings so you can match your fans to your case