CORSAIR SF850 850W 80+ Platinum Fully Modular ATX 3.1 SFX Power Supply

The Corsair SF850 is an 850-watt small form factor (SFX) power supply designed for compact, high-performance PC builds that demand serious power in a minimal footprint. Carrying the 80 PLUS Platinum efficiency rating, it delivers consistent, efficient power delivery while keeping waste heat — and therefore noise — to a minimum. Built to the ATX 3.1 standard, the SF850 is formally certified for ATX 3.1 compliance, a specification that sets stringent requirements for transient load handling and overall power reliability. It ships with a PCIe 5.1 12V-2×6 GPU cable, making it ready for modern discrete graphics cards such as those in the NVIDIA GeForce RTX 40 Series and newer. Cooling is handled by a 92mm fluid dynamic bearing PWM fan. In Zero RPM mode the fan remains completely stationary at low to moderate loads, eliminating fan noise entirely during everyday use. Under sustained heavy workloads the fan spins up proportionally to maintain safe operating temperatures — with the unit rated for continuous operation up to 50°C ambient, an important consideration in thermally constrained SFF enclosures. The SF850 uses 100% Japanese electrolytic capacitors rated to 105°C, contributing to long-term stability and reliability. Its fully modular design uses Type-5 Micro-Fit PSU connectors, meaning only the cables you actually need connect to the unit. This is especially beneficial in small cases where cable routing space is scarce and tidiness directly affects airflow. With four PCIe (6+2-pin) connectors and four peripheral (4-pin) connectors, the SF850 has enough outputs to support a single high-end GPU alongside multiple storage devices and accessories — all within an SFX chassis. Verified Specifications: • Model: CP-9020256-IN • Series: SF Series • Wattage: 850 W • Efficiency Certification: 80 PLUS Platinum • Form Factor: SFX • Standard: ATX 3.1 certified • Modular: Fully modular (Type-5 Micro-Fit connectors) • Cooling: 92mm fluid dynamic bearing PWM fan, Zero RPM mode • Continuous Operating Temperature: 50°C • Capacitors: 105°C-rated Japanese electrolytic • PCIe Connectors (6+2-pin): 4 • Peripheral (4-pin) Connectors: 4 • GPU Cable: PCIe 5.1 12V-2×6 included • Warranty: 7 years • Colour: Black