Conclusions
Contents
The new Seasonic X-400 Fanless is an impressive power supply. During our tests it achieved efficiency always above 87%, peaking 91.5%, voltages very close to their nominal values (3% regulation instead of the traditional 5% regulation), and extremely low noise and ripple levels. On top of that, due to its highly overspec’ed components, we could easily pull 600 W from it with efficiency still above 88%. This is remarkable. Seasonic could easily sell this power supply as a 600 W product, if they added more connectors, of course.
The only “problem” with this power supply is its price. It is hard to explain to the average user why this power supply costs more than twice the price of a good 400 W unit.
If you are a user who wants to build a completely silent PC or HTPC (home theater PC) and only demands “the best in class,” the new X-400 Fanless is an option. The average user, however, will find a better cost/benefit ratio in products that cost less.
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