Introduction and Features

The FOCUS Plus is Seasonic’s latest PSU series targeted at mainstream users.

Introduction

Seasonic’s new FOCUS Plus family of power supplies currently includes two different series ranging from 550W up to 850W output capacity with either Platinum or Gold efficiency certification. Earlier this year we looked at the FOCUS Plus Gold (FX) 650W power supply and found it to be an excellent new addition to Seasonic’s lineup. In this review we will be taking a detailed look at the Seasonic FOCUS Plus Platinum (PX) 550W power supply. And to insure that reviewers are not being sent hand-picked golden samples, Seasonic once again arranged to have our sample delivered straight from Newegg.com inventory.

The Seasonic FOCUS Plus Platinum series includes four models: 550W, 650W, 750W, and 850W. In addition to 80 Plus Platinum certification, the FOCUS Plus (PX) series features a small footprint chassis (140mm deep), all modular cables, high quality components, and comes backed by a 10-year warranty.

• FOCUS Plus Platinum (PX) 550W: $99.90 USD

• FOCUS Plus Platinum (PX) 650W: $109.90 USD

• FOCUS Plus Platinum (PX) 750W: $119.90 USD

• FOCUS Plus Platinum (PX) 850W: $139.90 USD

Seasonic FOCUS Plus 550W Platinum (PX) PSU Key Features:

• 550W Continuous DC output at up to 50°C

• 80 PLUS Platinum certified for high efficiency

• Small footprint: chassis measures just 140mm (5.5”) deep

• Tight voltage regulation ±3% (3.3V, 5V, and 12V)

• Fully-modular cables

• DC-to-DC Voltage converters

• Single +12V output

• Multi-GPU Technology support

• Quiet 120mm Fluid Dynamic Bearing (FDB) cooling fan

• Seasonic Hybrid Silent Fan Control

• Active Power Factor correction with Universal AC input (100 to 240 VAC)

• Safety protections: OPP, OVP, UVP, OCP, OTP and SCP

• 10-Year warranty

Here is what Seasonic has to say about their new FOCUS Plus 550W Platinum PSU:

“The fully modular, 80 PLUS® Platinum rated FOCUS+ Platinum 550 watt unit is based on the DC to DC Converter Design and its electric performance characteristics are impressive with their tight voltage regulation. These power supplies use high temperature Japanese capacitors to ensure stability under extreme conditions. Besides its stability and remarkable output characteristics, this unit has the highest power density in its class. Silence enthusiasts will appreciate the Seasonic Hybrid Silent Fan Control system that is the industry’s first three-phased advanced thermal control to achieve optimal balance between silence and cooling.

Due to its small form factor the FOCUS PLUS power supply is a great solution for those who want to build smaller systems and care about the airy arrangement inside their computer case. The fully modular cables are easy to install, save space inside the computer case and provide ample customization and upgrading possibilities at the same time. This mid power range power supply is not only small, but mean too. It boasts the highest power density in its class and it also has remarkable stability and output characteristics during operation.”