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Corsair RM850x 850Watt 80 Plus Gold Certified Power Supply is fully modular power supplies are built with the highest quality components to deliver 80 PLUS Gold efficient power to your PC, with virtually silent operation. The high-efficiency operation for lower power consumption, less noise, and cooler temperatures. A specially set fan curve ensures that, even at full load, fan noise is kept to a minimum. At low and medium loads the cooling fan switches off entirely for near-silent operation. Premium internal components ensure unwavering power delivery and long-term reliability. Only connect the cables your system needs, making clean and tidy builds easier. A 160mm-long casing ensures an easy fit in almost all modern enthusiast PC cases. Your guarantee of reliable operation that will last across several systems builds.