CORSAIR RM850x Gold (ATX 3.1, PCIe 5.1) is an 850W fully-modular power supply designed for modern PC builds — it’s certified Cybenetics Gold (meaning high efficiency), compliant with ATX 3.1, supports PCIe 5.1 (including a native 12V-2×6 GPU connector), uses 100% Japanese 105 °C-rated capacitors, features a quiet 140 mm fan with Zero RPM mode, and comes backed by a 10-year warranty.