NZXT C850 850W Gold Fully-Modular ATX PSU

Description

Overview

The NZXT C850 is an 850 W, 80 PLUS Gold, fully‑modular ATX power supply intended for desktop builders and gaming PCs that need reliable high‑current delivery and clean power. It complies with ATX 3.1 and includes a heat‑resistant 12V‑2×6 connector for modern GPUs (PCIe 5.1 readiness). The unit also uses a 135 mm fluid‑dynamic bearing fan with Zero‑RPM mode for near‑silent operation at low loads and is covered by a 10‑year manufacturer warranty. ([nzxt.com](https://nzxt.com/products/c850))

Key features

• Output: 850 W total, single +12 V rail (70.8 A, 850 W max). ([nzxt.com](https://nzxt.com/products/c850))
• Efficiency: 80 PLUS Gold class; measured efficiencies at 115 VAC: ~89.7% (20%), ~90.8% (50%), ~88.0% (100%). ([nzxt.com](https://nzxt.com/products/c850))
• Fully modular cabling to reduce clutter; NZXT advises using only the supplied modular cables (do not mix cables from other PSU models). ([nzxt.com](https://nzxt.com/products/c850))
• ATX 3.1 / PCIe 5.1 compatible with a dedicated 12V‑2×6 connector delivering up to 600 W to a GPU. ([overclockers.co.uk](https://www.overclockers.co.uk/nzxt-c-series-850w-80-gold-atx-3.1-pcie-5.1-modular-power-supply-black-pow-nzx-06566.html))
• Quiet cooling: 135 mm fluid‑dynamic bearing fan, 0–2300 RPM, Zero RPM mode under low load. ([nzxt.com](https://nzxt.com/products/c850))
• Compact ATX form factor: 150 x 150 x 86 mm. ([nzxt.com](https://nzxt.com/products/c850))
• 10‑year warranty from NZXT. ([nzxt.com](https://nzxt.com/products/c850))

Who it’s for

This PSU suits system builders who need an 850 W unit with ATX 3.1 support for modern GPUs, want a fully modular layout for neat cable management, and value a long warranty. It’s a common choice for high‑end single‑GPU gaming rigs and workstations where stable +12 V delivery and efficiency matter. ([nzxt.com](https://nzxt.com/products/c850))