Antec SF850X 850W SFX Power Supply - Compact Performance for Modern Gaming PCs

The Antec SF850X delivers 850 watts of reliable power in a compact SFX 4.1 form factor, engineered specifically for small form factor gaming builds. This fully modular power supply combines 80 PLUS Gold efficiency with ATX 3.1 and PCIe 5.1 compatibility, making it ready for the latest high-performance graphics cards and processors.

Efficiency and Power Output

Certified 80 PLUS Gold with up to 92% efficiency at 50% load, the SF850X minimizes energy waste while delivering consistent power. The 12V rail is rated over 90% of total output capacity, ensuring your high-end components receive stable, clean power. High-quality Japanese capacitors provide long-term reliability and consistent performance under demanding workloads.

Advanced Architecture and Protection

Built with an active clamp design and DC-DC module, the SF850X maintains stable voltage regulation across all rails. The comprehensive CircuitShield protection suite includes OCP, OVP, UVP, SCP, OPP, OTP, SIP, and NLO safeguards. Full range voltage power off protection actively shields your PSU and motherboard during power interruptions.

Modular Design and Cable Management

100% modular cabling allows you to connect only the cables you need, reducing clutter in compact cases. The flat black cables simplify routing and improve airflow while maintaining a clean aesthetic. Connector options include 24-pin motherboard, dual 8-pin CPU, 16-pin PCIe 5.1 12VHPWR, four 8-pin PCIe, six SATA, and two Molex connections.

Thermal Management

The 92mm silent fan features Zero RPM Manager technology, which stops the fan during low loads for completely silent operation. When cooling is required, the intelligent thermal control system balances noise levels with efficient heat dissipation, maintaining optimal operating temperatures between 0-40°C.

Compact Dimensions for SFF Builds

Measuring just 100 x 125 x 63.5mm, the SF850X fits standard SFX cases while providing ATX-level power output. This makes it ideal for high-performance ITX builds, compact workstations, and space-conscious gaming setups that don't compromise on power delivery.

7-Year Warranty Coverage

Antec backs the SF850X with a comprehensive 7-year warranty, demonstrating confidence in the unit's build quality and long-term reliability.

Specification

Model
SF850X 80PLUS Gold

Type
ATX 12V 3.1 (SFX 4.1)

Dimension
100 x 125 x 63.5 mm (L x W x H)

Modular
Full-Modular

Warranty
7 years

Input Voltage
100V-240V

Input Current
12A-6A

Input Frequency Range
60Hz-50Hz

PFC
Active PFC

Power Good Signal
100-150ms

Protection
OCP, OVP, UVP, SCP, OPP, OTP, SIP, NLO

Output Capacity
850W

Operation Temperature
0~40°C

Regulatory
cTUVus / TUV / CB / RCM / CE / FCC / BIS / BSMI / KC / UKCA / ICES / CCC

Fan
92 mm Silent Fan

Certifications
80 Plus Gold

Connector
1 x 24(20+4)pin MB
1 x 16(12+4)pin PCIE 5.1 12VHPWR
2 x 8(4+4)pin CPU
4 x 8(6+2)pin PCI-E
6 x SATA
2 x Molex

Unit Box Dimensions
236 x 184 x 106 mm (L x W x H)

Net Weight
1.785 kg

Gross Weight
2.12kg

• Wattage: 850W
• Size/Version: SFX
• Modular: Fully
• SATA Connections: 8
• Certification: Gold
• Colour: Black