Corsair RM550x series power supplies are built with the highest quality components to deliver 80 PLUS Gold efficient power to your PC. Using only Japanese 105 DegreeC capacitors, users can depend on an RM550x PSUs' long life and reliability, backed by a ten-year warranty. 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.