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SeaSonic Platinum Series SS-400FL2 Active PFC F3 400W ATX12V Fanless 80 PLUS Platinum Certified Modular Active PFC Power Supply New 4th Gen CPU Certified Haswell Ready

Newegg PC Builder
  • ATX12V v2.3 / EPS12V v2.91
  • 80 PLUS Platinum Certified
  • Fanless
🔥Don't forget your OS, we have Windows 11 OEM, 10 OEM, Download and USB versions available

Power your system with ultimate efficiency and acoustics. The full modular and single +12V designed SeaSonic Platinum series fanless power supply is fourth generation Haswell CPU-ready and complies with the highest 80PLUS standard - 80PLUS Platinum. Fanless design with ultra-ventilated honeycomb structure offers silent operation without compromising cooling performance.

Exclusive DC Connector Panel with Integrated Voltage Regulation Module

Seasonic’s exclusive DC connector panel with integrated voltage regulation module optimizes efficiency and cooling by minimizing voltage drops and impedance for enhanced performance and reliability. The Platinum Series fanless power supply achieves up to ±2% of tight voltage regulation. This series power supply also has dual-sided PCB layout.

Exclusive DC Connector Panel with Integrated Voltage Regulation Module graph shows optimized efficiency

The full modular cabling design allows use of only the cables you need resulting in improved internal airflow and reduced system clutter. Easy-swap connectors allow for easy, quick and safe unplugging. High current gold-plated terminals ensure optimal signal transfer and stability of connected devices. All-in-one DC cabling design supports PC, IPC, workstation and server systems.

Full modular cabling design

80+ Platinum

80+ Platinum

This 80+ Platinum-certified series power supply delivers energy savings of up to 92% efficiency and a true power factor of greater than 0.9PF.


Japanese Capacitors

Seasonic uses durable 105°C Japanese Grade A capacitors and Conductive Polymer Aluminum Solid Electrolytic Capacitors on the Platinum Series fanless power supply for uncompromised performance, reliability and lifespan.

Strong Single +12V

Strong single +12V

The Platinum Series fanless power supply uses high single +12v rail design which provides enough power to your high-end components, including your high-end CPU and graphics card.

PCI-Express Connector

PCI-Express connector

One 6+2 / 6-pin PCI-Express connector supports high end graphics card for jaw dropping graphics performance.


Enjoy maximum safety

Enjoy maximum safety and stability thanks to comprehensive approvals.

What's Included:

box content


Warranty & Returns

Warranty, Returns, And Additional Information


  • Limited Warranty period (parts): 7 years
  • Limited Warranty period (labor): 7 years
  • Read full details

Return Policies