80 Plus Gold certified for lower power consumption, less noise and cooler temperatures. Tuned for low noise operation even at full load. Zero RPM fan mode for near silent operation at low to medium loads. 100 percent industrial grade, 105 degree C rated Japanese capacitors ensure unwavering power and reliability. Fully modular cables, so you only connect the cables your system needs. Corsair RM550x series power supplies are built with the highest quality components to deliver 80 PLUS Gold efficient power to your PC. Zero RPM Mode means an RM550x series PSU is virtually silent at low and medium loads, and even at maximum power, a low noise fan ensures quiet operation. Fully modular cables make PC builds and upgrades easy, as you only need to install the cables your system requires. Quiet, efficient and dependable, an RM550x PSU has everything you need to power high-performance PC for years to come. Fan bearing technology – Rifle Bearing.