Fanless PSU Torture Test Roundup

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TEST RESULTS

A. SEASONIC X-400 FANLESS (SS-400FL)

We might as well start with the model that sparked this project. You can read the entire detailed review so just some key photos and info are presented here along with the torture test results.


It's well ventilated on almost every side...


...even the normally unvented "bottom". The X-400 (and soon-to-come X-460) is the only modular cable fanless PSU, not only in our roundup, but in the world market.


The label is in several languages and boasts a myriad of safety approvals.

If you've read our review of the X-400 Fanless, you already know the results, but here's the summary in the format we'll be using for all of the other torture-tested PSUs.

TORTURE TEST SUMMARY
Seasonic X-400 Fanless
400W Rated Output
Duration
Output (W)
Efficiency
Hotbox ¬įC
Power Factor
20 min
21.6
69.8%
24
0.89
42.6
80.4%
25
0.97
65.9
84.5%
27
0.98
90.5
85.4%
31
0.99
150.1
88.8%
35
0.99
198.2
92.2%
37
1.00
15 hrs
248.4
91.0%
40~44
1.00
399.3
89.9~87.9%
53~57
1.00
+12V Ripple (peak-to-peak): <13mV @ <150W ~ 18mV @ 400W
+5V Ripple (peak-to-peak): <5mV @ <150W ~ 7mV @ 400W
+3.3V Ripple (peak-to-peak): 5mV @ <150W ~ 12mV @ 400W
Voltage Regulation during 15 hr tests:
250W -
12.05V, 4.97V, 3.31V
400W - 12.04V, 4.97V, 3.30V
AC Power in Standby: 0.3W / 0.1 PF
AC Power with No Load, PSU power On: 7.2W / 0.70 PF
OTP Shutdown: Forced with additional heat from hair dryer. No-fuss recovery within a couple of minutes. Repeated several times without any incident.

ANALYSIS

As you will probably have read already in our review of the X-400 Fanless last week, the sample performed flawlessly throughout the torture test, with no change in the high quality of the DC outputs. About the only significant change was in efficiency; during the hottest times of the day, AC power input rose slightly, by about 10W. This is expected and natural.

When forced to Over Temperature Protection shutdown, the sample did so without any fuss, and recovery occurred with power off/on when the additional heat was removed.

The Seasonic X-400 sets the standard by which other fanless PSUs must be judged.



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