CORSAIR RM850x 850W Shift 80 + Gold Fully Modular ATX 3.0 Power Supply

The CORSAIR RM850x Shift redefines cable management in ATX power supplies with its patent-pending side-mounted modular connector panel. Instead of routing cables from the rear of the unit, all modular connections are accessed from the side face of the PSU — a practical advantage in cases where the PSU chamber is narrow or access from the traditional rear is obstructed. The unit requires a PC case that supports the ATX PSU form factor and is at least 210 mm (8.3 inches) wide, with side access to the PSU when mounted. At 850 watts of continuous output power, the RM850x Shift carries the 80 PLUS Gold certification, delivering up to 90% efficiency under typical loads. It is also Cybenetics-certified, reflecting independently verified efficiency, acoustic, and thermal performance. The unit is formally ATX 3.0 certified, meaning it satisfies the standard’s strict transient load handling and power delivery requirements — a distinction Corsair notes is separate from merely meeting those requirements informally. PCIe 5.0 12VHPWR GPU cables are included in the box, making the unit compatible with modern discrete graphics cards such as the NVIDIA GeForce RTX 40 Series without requiring an adapter. Cable connectivity is handled through Corsair Type 5 Gen 1 micro-fit connectors, a fully modular system that lets builders attach only the cables their system requires, reducing clutter. Cooling is managed by a 140 mm fluid dynamic bearing (FDB) fan. FDB fans use a thin film of fluid rather than traditional ball or sleeve bearings, resulting in lower friction, reduced operating noise, and extended service life. The fan also supports Zero RPM mode, remaining stationary at low and moderate loads to eliminate fan noise entirely during everyday desktop use. Capacitors throughout the unit are rated at 105°C and described by Corsair as 100% Japanese electrolytic, industrial grade — a specification associated with improved thermal tolerance and long-term reliability. Verified Specifications: – Continuous Power Output: 850 W – 80 PLUS Efficiency: Gold – ATX Standard: ATX 3.0 (formally certified) – Fan Size: 140 mm – Fan Bearing: Fluid Dynamic Bearing (FDB) – Zero RPM Mode: Supported – Cable Type: Corsair Type 5 Gen 1 (fully modular) – ATX Connector: 1 – EPS12V Connectors: 2 – PCIe Connectors: 4 – SATA Connectors: 12 – ATX12V Version: 3 – EPS12V Version: 2.92 – MTBF: 100,000 hours – Warranty: 10 Years – Weight: 1.7 kg – Minimum Case Width Required: 210 mm (8.3 in)