Final Thoughts and Conclusions

Seasonic’s new FOCUS Plus series is a refresh of their mainstream power supply lineup. The FOCUS+ Gold and Platinum series will eventually replace several of Seasonic’s popular G and S12G series power supplies. During our testing the FOCUS Plus 550W Platinum power supply delivered excellent voltage regulation, excellent AC ripple and noise suppression, and excellent efficiency, meeting the 80 Plus Platinum criteria even while operating on 120 VAC mains at elevated temperatures.  

The FOCUS Plus 550W Platinum power supply comes with a standard assortment of all modular cables with a combination of sleeved and flat ribbon-style cables. The 120mm cooling fan uses a high-quality Fluid Dynamic Bearing (FDB) for long life and quiet operation. The power supply also incorporates Seasonic’s Hybrid Silent Fan Control which allows semi fanless operation when engaged. High quality capacitors are used throughout and the FOCUS Plus Platinum series comes backed by a 10-year warranty!

The FOCUS+ Platinum PSUs are currently available from (September 2017):

•    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

•    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
•    Excellent voltage regulation
•    Excellent AC ripple and noise suppression
•    Quiet 120mm Fluid Dynamic Bearing (FDB) cooling fan
•    Hybrid Silent Fan Control allows selecting semi fanless operation
•    Fully-modular cables
•    Safety protections: OPP, OVP, UVP, OCP, OTP and SCP
•    10-Year warranty

Minor Weaknesses:
•    The 550W model is currently hard to find in stock

Another excellent power supply for the masses – highly recommended.

Seasonic FOCUS Plus 550W Platinum Power Supply

Our thanks to Seasonic for sending us the FOCUS+ 550W Platinum PSU to review!

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