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Guide: How to Build a Fanless Power Supply PC

Fanless ATX PSU options have never been plentiful. Many of the  models that came and went in the past decade couldn’t deliver their rated output,  made nasty electronic  noises, and/or overheated and shut down when asked to deliver substantial loads. Suitable only for low power systems, yet priced prohibitively high, it’s easy  to see why they never succeeded in growing much beyond a little niche. Our Fanless PSU Torture Test Roundup a year ago showed that there are still very few fanless PSUs worth considering.

On the positive side, three  modern fanless PSU models have  emerged that we can recommend without hesitation: The Seasonic X-400 and X-460, and the recently reviewed Kingwin Stryker STR-500.  All  are extremely efficient, with 80 Plus Gold or Platinum ratings, hold up well thermally and electrically under high load, and are as  silent as can be.  Current pricing for these units is also excellent with  Newegg offering the  X-400 and X-460 for  US$90 and US$110 respectively (after mail-in rebate).    The STR-500 is a bit pricier at US$160, but it’s a small price to pay for the most efficient,   silent, passively cooled PSU on the market.

The Seasonic X-400, X-460 and the Kingwin STR-500 are the best fanless ATX PSUs in the market.


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