Antec SF850X 850W SFX PSU 80 Plus Gold ATX 3.1 PCIe 5.1

Compact Size, Flagship Performance

The Antec SF850X 850W delivers powerful, efficient and reliable performance for modern small form factor gaming PCs and high-performance workstations. Built to the latest SFX 4.1 and ATX 3.1 standards, and fully compatible with PCIe 5.1 graphics cards, this premium power supply is engineered to meet the demands of next-generation hardware.

Featuring 80 Plus Gold certification, 100% modular cabling, a dedicated 12VHPWR connector, premium Japanese capacitors and comprehensive protection circuitry, the SF850X provides outstanding efficiency, stability and long-term reliability in compact Mini-ITX and SFF builds.

Key Features & Benefits

850W of Stable, High-Efficiency Power

Delivering a powerful 850W output, the SF850X is ideal for demanding gaming PCs and professional systems featuring modern CPUs and high-performance graphics cards.

Perfect for:

• Gaming PCs
• Small Form Factor Builds
• Mini-ITX Systems
• Content Creation Workstations
• Streaming Setups
• High-End GPU Configurations

Latest ATX 3.1 & PCIe 5.1 Support

Built to support the latest generation of graphics cards and processors.

Features include:

• ATX 3.1 Compliance
• PCIe 5.1 Ready
• Native 12VHPWR Connector
• Enhanced Power Excursion Handling
• Improved Future Compatibility

Ready for modern NVIDIA and AMD graphics cards without adapters.

80 Plus Gold Certified Efficiency

The SF850X achieves up to 92% efficiency at 50% load, helping to reduce energy consumption and excess heat generation.

Benefits:

• Lower electricity usage
• Reduced operating temperatures
• Improved system efficiency
• More stable performance under load

Fully Modular Cable Design

Use only the cables your build requires.

Advantages include:

• Cleaner cable management
• Improved airflow
• Simplified installation
• Easier upgrades and maintenance
• Tidier system appearance

The included flat black cables are perfect for compact PC builds where space is at a premium.

Premium Japanese Capacitors

High-quality Japanese capacitors provide outstanding reliability and long-term durability.

Benefits include:

• Enhanced system stability
• Improved voltage regulation
• Greater lifespan
• Consistent power delivery

Advanced Active Clamp + DC-to-DC Design

The SF850X uses an advanced power architecture for improved efficiency and regulation.

This design helps deliver:

• Stable voltage output
• Improved overall efficiency
• Reduced electrical noise
• Enhanced reliability under heavy loads

Zero RPM Manager for Silent Operation

The intelligent cooling system balances noise and cooling performance.

Features:

• Quiet everyday operation
• Reduced fan noise
• Improved thermal management
• Longer component lifespan

92mm Silent Cooling Fan

A high-quality 92mm fan provides effective cooling while maintaining low acoustic levels, making it ideal for compact systems where airflow is critical.

Comprehensive CircuitShield Protection

Built-in industrial-grade protection technologies safeguard your system against electrical faults.

Protection includes:

• OCP (Over Current Protection)
• OVP (Over Voltage Protection)
• UVP (Under Voltage Protection)
• SCP (Short Circuit Protection)
• OPP (Over Power Protection)
• OTP (Over Temperature Protection)
• SIP (Surge & Inrush Protection)
• NLO Protection

Power-Off Protection

Integrated voltage monitoring and shutdown protection help safeguard your PSU and connected components during power loss events.

Ideal For

• Small Form Factor (SFF) PCs
• Mini-ITX Gaming Builds
• Compact Workstations
• PCIe 5.1 Graphics Cards
• RTX 40 Series Systems
• Modern AMD & Intel Platforms
• High-Performance Gaming PCs
• Space-Conscious Enthusiast Builds

Technical Specifications

General

• Brand: Antec
• Model: SF850X
• Colour: Black
• Form Factor: SFX 4.1
• ATX Standard: ATX 3.1

Power

• Total Output: 850W
• 80 Plus Gold Certified
• Up to 92% Efficiency

Electrical

• Input Voltage: 100V-240V
• Input Current: 12A-6A
• Input Frequency: 50Hz-60Hz
• Active PFC
• Power Good Signal: 100-150ms

Cooling

• 92mm Silent Fan
• Zero RPM Manager

Design

• Fully Modular
• Flat Black Cables
• Compact SFX Form Factor

Connectors

• 1 x 24-Pin (20+4) Motherboard
• 1 x 16-Pin (12+4) PCIe 5.1 12VHPWR
• 2 x 8-Pin (4+4) CPU EPS
• 4 x 8-Pin (6+2) PCIe
• 6 x SATA
• 2 x Molex

Protection Features

• OCP
• OVP
• UVP
• SCP
• OPP
• OTP
• SIP
• NLO

Physical Specifications

• PSU Dimensions: 100 × 125 × 63.5mm
• Unit Box Dimensions: 236 × 184 × 106mm

Environmental

• Operating Temperature: 0°C to 40°C

Certifications

• 80 Plus Gold
• CE
• FCC
• UKCA
• TUV
• CB
• RCM
• BIS
• BSMI
• KC
• CCC
• ICES

Weight

• Net Weight: 1.785kg
• Gross Weight: 2.12kg

Warranty

• 7-Year Manufacturer Warranty

What's in the Box?

• Antec SF850X 850W Power Supply
• Fully Modular Cable Set
• PCIe 5.1 12VHPWR Cable
• Power Cable
• Mounting Hardware
• User Documentation

Why Choose the Antec SF850X 850W?

The Antec SF850X is the ideal power supply for enthusiasts building powerful compact PCs without compromising performance. Featuring 850W of reliable power, 80 Plus Gold efficiency, ATX 3.1 and PCIe 5.1 compatibility, native 12VHPWR support, premium Japanese capacitors and a fully modular design, it provides everything needed for modern gaming and workstation systems. Backed by a 7-year warranty, the SF850X delivers the efficiency, stability and future-ready performance demanded by today's high-end components.