Very stable voltage regulation.
Quiet due to fanlessness.
Very low ripple.
400W continuous DC output.
Excellent efficiency across a broad range of loads.
Single 12V output can deliver up to 33A/396W.
One PCIE connector (6/8pin).
Some minor build quality blips involving the soldering.
Slight jump in AC ripple on 5VSB rail at moderate load.
By X-bit Labs on November 28, 2010
Still, I have to remind you that building computers with fanless PSUs requires some experience. You shouldn’t try to remove all the fans from your system case because they cool not only the components they are actually attached to, but also other...-
By JonnyGuru on September 13, 2010
Folks, Seasonic's come up with another winner. They've taken the X series platform, removed the fan, fixed the lingering issues with the platform, and come up with an outstanding fanless unit that's sure to please anyone looking for a good...95
By BeHardware on August 27, 2010
Seasonic is the first manufacturer to put low power fanless 80 PLUS Gold power supplies on the market. Doing this is one thing, but doing it well is quite another and here Seasonic has put in a faultless performance. In terms of organization first of...-
By PCPer on August 19, 2010
No fan – no moving parts – no noise! Like its big brothers, the new X Series 400W fanless PSU incorporates several significant advances in PC power supply design that result in excellent performance, high efficiency and the ability to...-
By Hardware Secrets on August 19, 2010
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...-
By HardOCP on August 13, 2010
Before even beginning to sum this unit up it is important to remember one thing; the X-400FL is a niche product meant for only a small subset of users. Niche products often are more expensive than more broadly applicable solutions for various economic...-
By HardwareHeaven on August 12, 2010
It is often the case that the lower rated models in a power supply product family feel like cheap recreations of their higher specification versions. Using components which are nowhere near the same class, cutting corners in build quality and...-
By SilentPC Review on August 12, 2010
Expectations ran high for the X-series 80 Plus Gold Seasonic power supplies, but our first reaction to the X-400 Fanless was admittedly less than enthusiastic. With the X-series already fanless to ~200W load and extremely quiet even after the fan...-
By Hard-H2O on December 20, 2011
No podemos decir otra cosa que nos encontramos ante unos de las mejores marcas de fuentes a nivel mundial; desde la calidad de fabricación hasta los acabados de la fuente en sí, son perfectos. Respecto a la regulación de voltajes,...-
By Magnus.de on January 31, 2011
135 Euro sind ein stolzer Preis für ein 400-Watt-Netzteil. Das X-400FL ist dank völliger Geräuschlosigkeit und hervorragender Messwerte aber jeden Cent...100