CORSAIR RM850e 850W 80+ Gold ATX 3.1 Fully Modular Power Supply

The Corsair RM850e is an 850-watt fully modular ATX power supply from the RMe Series, designed for enthusiast desktop builds that demand stable, efficient power delivery. Formally certified to Intel’s ATX 3.1 standard and compatible with PCIe 5.1, it ships with a dedicated native 600W-capable 12V-2×6 GPU power cable — the connector format required by current and upcoming high-end graphics cards — removing the need for daisy-chained adapters. Efficiency is rated at 80 Plus Gold and independently verified under the Cybenetics Gold programme, which also awards the unit a Cybenetics Noise class A rating. In practice this means the RM850e can operate at up to approximately 90% efficiency under typical loads, reducing heat output and electricity draw compared with lower-tier ratings. The 140 mm-long chassis fits comfortably in modern mid-tower and full-tower cases, leaving more room for tidy cabling. Cooling is handled by a 120 mm rifle-bearing fan operating on a custom fan curve; Zero RPM mode lets the fan remain stationary under light loads for near-silent operation. When the system enters Modern Standby, the RM850e’s precise timing support enables fast wake- sleep transitions and improved low-load efficiency. Internally, the RM850e uses a resonant LLC topology with DC-to-DC conversion and 105 °C-rated industrial-grade capacitors, a combination that supports consistent voltage regulation and long-term reliability. Corsair rates mean time between failures (MTBF) at 100,000 hours and backs the unit with a 7-year warranty. Verified Specifications: • Model: CP-9020296-IN • Wattage: 850 W • Series: RMe • Efficiency: 80 Plus Gold / Cybenetics Gold • ATX Standard: ATX 3.1 certified • PCIe Compatibility: PCIe 5.1 • Modular: Fully modular • Fan: 120 mm rifle-bearing, Zero RPM mode • Dimensions: 140 × 150 × 86 mm • ATX Connector: 1 • EPS Connector: 2 • PCIe Connector (12V-2×6 native): 1; additional PCIe (6+2): per source listing total 3 • SATA Connector: 6 • PATA Connector: 2 • Modern Standby: Yes • MTBF: 100,000 hours • Warranty: 7 years • Cybenetics Noise Class: A