Seasonic Platinum Fanless 520 W Power Supply Review

Conclusions

We were really impressed with the Seasonic Platinum Fanless 520 W. It achieved the feat of being the best power supply we’ve ever reviewed.

Efficiency was always above 90%, surpassing the requirements of the 80 Plus Platinum certification by a good margin. Most power supplies we test can’t deliver the promised efficiency at high temperatures, since the tests for the 80 Plus certification are conducted at 23° C, and efficiency drops as temperature increases.

The efficiency numbers are more incredible when you take into consideration that this is a fanless power supply. Power supplies without a fan may work internally at higher temperatures, meaning lower efficiency.

Voltage regulation was superb, with all outputs within 3% of their nominal values. Noise and ripple levels were extremely low, making this unit a flawless product.

Even the price of this power supply (USD 150) is more than right when you compare it to its competitors. For example, the SilverStone Nightjar 500 W is a fanless power supply with the 80 Plus Bronze certification and is sold for USD 185. 

If you are building a quiet computer and want “the best,” the Seasonic Platinum Fanless 520 W is the power supply you should buy.