CORSAIR SF850 850W 80 PLUS Platinum Fully Modular SFX Power Supply – Black | CP-9020256-UK
The CORSAIR SF850 is a compact 850W SFX power supply designed for powerful small-form-factor computers. It combines 80 PLUS Platinum efficiency, ATX 3.1 compliance, PCIe 5.1 support, fully modular Type 5 cables, a dedicated 12V-2x6 GPU connection, Japanese capacitors, and quiet Zero RPM cooling.
Product Overview
The CORSAIR SF850 CP-9020256-UK delivers high-performance power in a compact SFX form factor, making it an excellent choice for small-form-factor gaming computers and space-efficient workstation builds. Despite its reduced dimensions, it provides 850W of continuous power, including up to 70.8A through the primary +12V rail.
Its 80 PLUS Platinum and Cybenetics Platinum efficiency ratings help reduce wasted electricity, heat output, and cooling requirements. The power supply is designed for reliable continuous operation at ambient temperatures reaching 50°C and uses 100% industrial-grade Japanese electrolytic capacitors rated for operation at up to 105°C. corsair.com
The SF850 is officially compliant with Intel ATX 3.1 requirements and supports PCIe 5.1 graphics hardware. An included 12+4-pin GPU cable provides a direct power connection for compatible modern graphics cards without requiring a conventional multi-cable adapter. Three PCIe 6+2-pin cables are also included for graphics cards using traditional PCIe power connections.
Its fully modular CORSAIR Type 5 Micro-Fit cable system allows builders to connect only the required cables. The included cables are individually sleeved and use practical shorter lengths suited to compact cases, helping reduce cable congestion and improve airflow. corsair.com
Cooling is provided by a 92mm fluid-dynamic-bearing PWM fan. Zero RPM mode stops the fan during low-to-medium workloads, providing silent operation when active cooling is unnecessary. corsair.com
Please check the official manufacturer website for the latest and most accurate compatibility, clearance, radiator, fan, and I/O specifications before purchase or finalizing a build.
Key Features
- ⚡ 850W Continuous Power Output
- 📦 Compact SFX Form Factor
- 🥇 80 PLUS Platinum Efficiency
- 🏅 Cybenetics Platinum Efficiency
- 🔌 Fully Modular Cable Design
- 🧩 CORSAIR Type 5 Micro-Fit Connectors
- ✅ Intel ATX 3.1 Compliant
- 🎮 PCIe 5.1 Support
- 🔋 Dedicated 12V-2x6 GPU Cable
- 🎮 3 × PCIe 6+2-Pin Connectors
- 🤫 Zero RPM Fan Mode
- 🌀 92mm Fluid-Dynamic-Bearing PWM Fan
- 🌡️ 100% Japanese 105°C Capacitors
- 🔥 Continuous Output Rated at 50°C
- 🧵 Individually Sleeved Modular Cables
- 💾 8 × SATA Power Connectors
- ⚫ Black Finish
Technical Specifications
| Category | Power Supply |
| Manufacturer | Corsair |
| Model | CP-9020256-UK |
| Wattage | 850W |
| Efficiency | 80 PLUS Platinum |
| Form Factor | SFX |
| Modular | Fully Modular |
| ATX Standard | ATX 3.1 |
| GPU Power Connector | PCIe 5.1 / 12VHPWR |
| Fan | 92mm FDB |
| Color | Black |
| Warranty | 7 Year Manufacturer Warranty |
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