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The Corsair RM850 2021 is a desktop computer power supply unit (PSU). It is 80 PLUS Gold certified, which means that it is highly efficient in converting electricity into usable energy for your computer.

The PSU is designed to deliver 850 watts of power, which is sufficient to power a high-end system with multiple graphics cards and processors. It features a single +12 volt rail that provides a maximum power of 70.8 amps, which is enough to power energy-intensive components.

The Corsair RM850 is equipped with a 135 mm fan that only activates when the PSU needs additional cooling, making it quieter. It also has safety protections such as overcurrent, overvoltage, overheat, and short-circuit protection to safeguard your system from electrical damage.

The PSU is fully modular, which means that you can connect only the cables you need for your system, making installation easier and enabling cleaner wiring. The cables are flat and black for a sleeker look and better airflow in the case.

Overall, the Corsair RM850 2021 is an excellent option for desktop computer users who are looking for a reliable and efficient power supply.