Power Supply NZXT C850 SFX Black — 850W, 1×12‑pin high‑power GPU, 3×PCIe, modular cables

NZXT C850 SFX Black is a compact SFX power supply designed to deliver 850 watts of continuous power for small-form-factor PCs. The unit supports modern high-power graphics cards with a single 12‑pin high‑power GPU connector and includes three additional PCIe connectors for flexible GPU and accessory configurations. Its fully modular cable system reduces clutter and helps maintain airflow inside compact cases while providing stable power to CPU, GPU, storage devices and peripherals.

Advantages

The NZXT C850 SFX Black combines a high wattage output in a compact SFX chassis, making it suitable where space is limited without sacrificing power delivery. The presence of a 12‑pin high‑power GPU connector simplifies wiring for newer graphics cards and reduces the need for multiple adapters. Fully modular cables allow for tailored installations that improve case airflow and cable management. The design supports stable and efficient power distribution across system components, aiding compatibility with demanding gaming and workstation builds.

Suitable for

• Small-form-factor gaming PCs that require high GPU power in compact cases
• Mini-ITX workstations with powerful graphics cards
• Systems where modular cabling and improved airflow are priorities
• Upgrades to compact rigs that need a single high‑power GPU connector

Key specifications

• Form factor: SFX
• Maximum continuous output: 850 W
• High-power GPU connector: 1 × 12‑pin
• PCIe connectors: 3 × standard PCIe
• Cabling: Fully modular cable set for customizable routing
• Color: Black

How to use

Install the NZXT C850 SFX Black into an SFX-compatible case or use an SFX-to-ATX adapter bracket if required by your chassis. Connect the modular cables only as needed: attach the 12‑pin high‑power GPU connector directly to a compatible graphics card, and use the three PCIe connectors for additional GPUs or PCIe-powered devices according to the device documentation. Connect the appropriate motherboard, CPU, storage and peripheral power cables. Verify all connectors are fully seated and secure before powering on the system.

Usage recommendations

For reliable operation, ensure your case supports SFX units and that airflow is not obstructed. Use only the supplied modular cables to maintain electrical safety and reduce connector mismatch. Check GPU manufacturer guidance for 12‑pin connector power requirements and avoid using uncertified adapters. Regularly inspect connections and keep vents clear of dust to preserve cooling efficiency and long-term stability.