NZXT C850 SFX Gold power supply, angled front view

NZXT C850 SFX Gold power supply, fan and AC input

NZXT C850 SFX Gold power supply, three-quarter view

NZXT C850 SFX Gold power supply, fan grille top view

NZXT C850 SFX Gold modular cable connector panel

C850 SFX Gold

850 Watt 80 PLUS Gold SFX Fully Modular ATX 3.1 PSU

$199.99

Color

Where to Buy

Key Specs

Wattage: 850 W
Efficiency: 80 PLUS Gold, Cybenetics Platinum
Form Factor: SFX 3.1
Dimensions (W x H x D): 125 x 63.5 x 100 mm
GPU Power: 1x 16-pin 12V-2x6, 2x 16-pin to dual 8-pin PCIe, 1x 8-pin (6+2) PCIe
Cabling: Fully modular
Cooling: 92 mm fan, Zero RPM Mode
Warranty: 10 years

Inside the Box

C850 SFX GOLD
24-pin ATX Power Cable
4+4-pin CPU Power Cable
6+2-pin PCIe Power Cable
16-pin (PSU) to dual 8-pin (6+2) PCIe Power Cable
16-pin (12+4) 12V-2x6 PCIe Power Cable
SATA Cable x2
Peripherals Cable
AC Power Cord
Installation Accessories

Warranty & Return Policy

Warranty coverage — See NZXT warranty terms by product
Returns & exchanges — NZXT components and accessories are sold through authorized retailers. Start a return or exchange with the retailer you purchased from.
Warranty service — Submit a request to NZXT Support. Proof of purchase from an authorized NZXT retailer is required.

Resources

Manuals & Documentation

Overview

The C850 SFX Gold is an efficient, compact solution built for your small form factor (SFF) setup. It’s fully ATX 3.1 compliant and includes a 600W 12V-2x6 connector, ensuring steady performance for demanding graphics cards. Experience stable, quiet, and cool power delivery, all within a tiny footprint.

Designed for Compact Builds: Maximize your space efficiency with the SFX form factor, delivering full power capabilities in a size optimized for small form factor (SFF) cases.
Reliable GPU Power: ATX 3.1 certification and a 600W 12V-2x6 connector ensure safe, dependable power delivery for modern graphics cards.
Premium Efficiency, Quiet Operation: 80 PLUS Gold & Cybenetics Platinum efficiency ratings mean less heat is generated, while Cybenetics A- noise rating ensures a quieter overall system.
Uninterrupted System Performance: Low ripple noise, tight voltage regulation, and long hold-up time help protect your components and keep your system running smoothly.
Silent Cooling with FDB Fan: A 92 mm fluid dynamic bearing (FDB) fan offers durable and efficient cooling, featuring a Zero RPM mode for silent operation.
Enhanced Durability and Stability: Constructed with 105°C-rated Japanese capacitors, guaranteeing long-term reliability and stable performance especially during heavy workloads.
Simplify Cable Management: Fully modular design with embossed cables and included combs allows you to connect only the essentials, improving routing in tight builds.
Built for Safety and Longevity: A full suite of safety protections and rigorous stress testing help safeguard your PC, all backed by a 10-year warranty for long-term peace of mind.

Power, Perfectly Compact

Experience focused power in minimal spaces with the C850 SFX Gold, delivering 80 PLUS Gold efficiency and ATX 3.1 reliability. Designed specifically for small yet powerful builds, it is the essential, capable core of your system.

Made For Smaller Cases

The SFX form factor slides easily into the smallest cases, offering dependable, high-output power without taking up unnecessary room.

Ready for Great Builds

With ATX 3.1 and PCIe 5.1 support, power is prepared for today and the future. Includes a 600W 12V-2x6 cable to reliably power demanding graphics cards.

Efficient Power Delivery

80 PLUS Gold certification and Cybenetics Platinum rating mean less wasted energy and cooler operation. Efficient power is smart power.

Premium Japanese Capacitors

Built with 100% Japanese capacitors rated to 105°C for consistent, long-term performance and reliability that lasts for years.

Simple, Clean Connections

Fully modular, embossed all-copper cables let you connect only what you need, while included PSU cable combs keep runs clean, aligned, and organized.

Whisper-Quiet Cooling

A 92 mm fluid dynamic bearing fan with Zero RPM mode and A- Cybenetics noise rating keeps cooling near-silent and consistent under any load.

Safe, Stable, Secure

Build and use with confidence. A full set of safety features ensures performance is reliable and worry-free. Everything is protected by a 10-year warranty.

Tech Specs

Dimensions

Width: 125 mm
Height: 63.5 mm
Depth: 100 mm
Weight: 0.97 kg (2.1 lb)

General

Wattage: 850 W
Form Factor: SFX
ATX Version: 3.1
80 PLUS Rating: Gold
Cybenetics Efficiency: Platinum
Cybenetics Noise: A-
Modular: Fully modular
Capacitors: All 105°C-rated Japanese
Cable Type: Individually embossed with cable comb

Cable Length & Connector Quantity

24-pin ATX Power Cable: 350 mm (1)
4+4-pin CPU Power Cable: 470 mm (1)
6+2-pin PCIe Power Cable: 470 mm (1)
16-pin (PSU) to dual 8-pin (6+2) PCIe power cable: 470 mm (2)
16-pin (12+4) 12V-2x6 PCIe Power Cable: 470 mm (1)
SATA Cables: 100 + 100 mm (6)
Peripherals Cable: 100 + 100 mm (3)

AC Input Rating

Voltage: 100 – 240 Vac
Current: 10 – 5 A
Frequency: 50 – 60 Hz

DC Output Rating

+3.3 V and +5 V: 20 A (100 W)
+12 V: 70.83 A (850 W)
5VSB: 3 A (15 W)
Total: 850 W

Energy Efficiency

80 PLUS Rating: Gold
10% Load: 85.9% @ 115 V
20% Load: 91.1% @ 115 V
50% Load: 92.1% @ 115 V
100% Load: 89.2% @ 115 V

Fan Specs

Size: 92 mm
Type: PWM
Speed: 3,500 ± 10% RPM
Airflow: 57 CFM
Noise Level: 41 dBA
Bearing: Fluid dynamic bearing
Zero RPM Fan Mode: Yes

Operation

MTBF: 100,000 hours
Temperature: 0 – 50°C

Electrical Features

PF Correction: Active @ 0.97
Protections: OVP (Over Voltage Protection), UVP (Under Voltage Protection), SCP (Short Circuit Protection), OTP (Over Temperature Protection), OPP (Over Power Protection), OCP (Over Current Protection)

Product Info

Warranty: 10 years
Compliance Standard: ATX12V v3.1 / EPS12V v2.92
Regulation & Certification: CE, UKCA, FCC, IC, BSMI, CB (IEC 62368-1 Ed. 3), LVD (EN 62368-1 Ed. 2), KC
Model Number: PS-8G1BB-US / PS-8G1BB-EU / PS-8G1BB-UK / PS-8G1BB-JP
UPC: 810074847414 (US) / 810074847421 (EU) / 810074847407 (UK) / 810074847438 (JP)
EAN: 5056547207377 (US) / 5056547207384 (EU) / 5056547207360 (UK) / 5056547207391 (JP)

Frequently Asked Questions

Can I use an SFX PSU in a regular ATX case?

Yes, but be mindful of the cable lengths. We include all the connections required for a high performance build but optimized for a Small Form Factor (SFF) / mini-ITX build. We do not include a SFX to ATX bracket.

Is the C850 SFX compatible with the latest GPUs and CPUs?

Yes. The C850 SFX is ATX 3.1 and PCIe 5.1 compliant, making it ready for the latest GPUs with the 12V-2x6 connector. It also includes PCIe cables for older graphics cards, as well as all the standard connectors needed for current AMD and Intel CPUs.