POWER YOUR SYSTEM WITH CONFIDENCE

The Seasonic S12III Series provides reliable and efficient power for everyday desktop computers, office systems and mainstream gaming PCs.

Built to Seasonic’s high-quality standards, the S12III series combines proven power supply technology with efficient performance and intelligent cooling. Available in 550W and 650W options, it provides practical power capacity for a wide range of modern PC configurations.

80 PLUS Bronze Efficiency

The Seasonic S12III is 80 PLUS Bronze certified, delivering efficient power conversion and reducing unnecessary energy waste.

With efficiency levels of up to 85% at typical operating loads, the power supply helps reduce heat generation and improve overall system efficiency.

Stable and Reliable Power Delivery

The advanced LLC resonant converter design helps provide stable and efficient power delivery across different workloads, supporting reliable operation for important PC components.

Smart & Silent Fan Control

The integrated S2FC Smart & Silent Fan Control system intelligently manages cooling performance and fan speed.

This helps maintain a balance between effective cooling and low noise, keeping your PC operating quietly during normal and moderate workloads.

Active Power Factor Correction

Active PFC improves power efficiency and helps optimize the performance of the power supply.

Standard ATX Compatibility

The standard ATX form factor makes the Seasonic S12III compatible with a wide range of desktop computer cases, making it suitable for new PC builds and power supply replacements.

Built for Everyday Computing

Whether you are building an office computer, home desktop or mainstream gaming PC, the Seasonic S12III provides dependable power for long-term everyday use.

Key Features

80 PLUS Bronze Certified ? Efficient power delivery with reduced energy waste.

550W / 650W Options ? Choose the appropriate power capacity for your PC configuration.

LLC Resonant Converter ? Designed for stable voltage regulation and efficient performance.

Smart & Silent Fan Control (S2FC) ? Intelligent cooling designed to minimize noise.

Active PFC ? Improves power efficiency and performance.

Standard ATX Form Factor ? Compatible with standard desktop PC cases.

120mm Cooling Fan ? Provides efficient thermal management.

Non-Modular Design ? Fixed cables for straightforward installation.

Seasonic Quality ? Designed for reliable long-term PC operation.