Antec SF850X 850W SFX Power Supply 80+ Gold
Antec SF850X 850W SFX Power Supply 80+ Gold
SKU:PSA-850SFX
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- 7 years Manufacturer Warranty
Product Information
| Brand | Antec |
|---|---|
| Category | Power Supplies |
| SKU | PSA-850SFX |
| Availability | In Stock |
Overview
- The Antec SF850X is a purpose-built SFX power supply engineered for modern high-performance systems in compact chassis. At just 100 x 125 x 63.5mm, it delivers 850W of stable, efficient power without sacrificing space or performance. With full modular cabling, you achieve clean builds and simplified cable management—critical in small form factor cases where every millimetre counts.
Fully compatible with ATX 3.1 and PCIe 5.1 standards, the SF850X powers the latest graphics cards including RTX 4090, RTX 5090, and AMD's XTX 7900/8900X series. The 80+ Gold efficiency rating minimises heat and power loss, keeping operating costs low. Zero RPM silent mode intelligently manages fan speed for whisper-quiet operation during light loads, then engages full cooling under demanding workloads.
Built with high-quality Japanese capacitors, active PFC, and a full suite of industrial-grade protections (OCP, OVP, UVP, SCP, OPP, OTP), the SF850X ensures reliable power delivery in any scenario. The 7-year warranty reflects Antec's confidence in build quality and longevity.
Specifications
| Brand | Antec |
|---|---|
| Model | SF850X |
| Product Type | SFX Power Supply |
| Power Output | 850W |
| Efficiency Rating | 80+ Gold |
| Form Factor | SFX 4.1 |
| Modular | Fully Modular |
| Dimensions | 100 x 125 x 63.5mm (L x H x W) |
| Weight | Not specified |
| Fan | 92mm Silent Fan |
| ATX Standard | ATX 12V 3.1 |
| PCIe Standard | PCIe 5.1 |
| Input Voltage | 100V–240V |
| Input Current | 12A–6A |
| Input Frequency | 50–60Hz |
| Power Factor Correction | Active PFC |
| Power Good Signal | 100–150ms |
| Operating Temperature | 0°C to 40°C |
| Protections | OCP, OVP, UVP, SCP, OPP, OTP, SIP, NLO |
| MB Connector | 1 x 24-pin (20+4) |
| PCIE 5.1 Connector | 1 x 16-pin (12+4) 12VHPWR |
| CPU Connectors | 2 x 8-pin (4+4) |
| PCIe Connectors | 4 x 8-pin (6+2) |
| SATA Connectors | 6 x SATA |
| Molex Connectors | 2 x Molex |
| Capacitors | Japanese high-quality |
| Certifications | 80 Plus Gold, cTUVus, TUV, CB, RCM, CE, FCC, BIS, BSMI, KC, UKCA, ICES, CCC |
| Warranty | 7 years |
Key Features
Ideal For
FAQs
Is the Antec SF850X suitable for RTX 4090 and RTX 5090 graphics cards?
Yes. The SF850X supports ATX 3.1 and PCIe 5.1 standards, including the 12VHPWR connector required by RTX 4090, RTX 5090, and AMD XTX 7900/8900X series cards. It delivers 850W of stable power for these demanding GPUs.
What is the physical size of the SF850X?
The SF850X measures 100 x 125 x 63.5mm (length x height x width), making it one of the most compact 850W power supplies. It fits standard SFX chassis and most small form factor cases.
Does the Zero RPM feature mean the fan never runs?
No. Zero RPM mode intelligently stops the fan during light loads to reduce noise. Under higher power draw or elevated temperatures, the fan automatically engages for active cooling. This balances silent operation with thermal efficiency.
What does 80+ Gold efficiency mean?
80+ Gold means the power supply converts at least 87% of input power to usable DC output (at 50% load). Higher efficiency reduces heat generation, lowers electricity costs, and improves system stability.
Is the Antec SF850X fully modular?
Yes. All cables are fully modular, allowing you to connect only the cables you need. This enables clean builds, improved airflow, and simplified cable management—especially valuable in compact cases.
What warranty does the SF850X include?
The SF850X comes with a 7-year manufacturer warranty, reflecting Antec's confidence in the unit's quality and reliability.
What protections does the CircuitShield™ suite provide?
CircuitShield™ includes comprehensive industrial-grade protections: OCP (overcurrent), OVP (overvoltage), UVP (undervoltage), SCP (short-circuit), OPP (overpower), OTP (overtemperature), SIP (surge), and NLO (no-load) protection.
Can the SF850X work with standard ATX motherboards?
Yes. The SF850X is backwards-compatible with standard ATX systems via its 24-pin (20+4) motherboard connector and supports both legacy and modern CPU connectors (8-pin and dual 8-pin variants).
