Seasonic SS-350TGM TFX 350W Power Supply

REVIEW INFORMATION
SUPPLIED BY: Seasonic USA
MANUFACTURER: Seasonic
PRODUCT: SS-350TGM TFX
PROD LINK: Seasonic’s Current TFX Offerings
PRICE: $69.99 @ NewEgg
Price is at the time of testing!

It’s time for some action, Jackson. It’s time for some science stuff, McGruff. It’s time for some load testing… er, Pesting. One SM-268 will be all I need to load this little guy today, and the rest of the test bench will be in play as always.

SS-350TGM TFX – STANDBY Load Tests
Test # +5VSB DC Watts/
AC Watts
Eff. P.F.
Load Tests
1 0.5A 2.54W/
3.20W
79.4% 0.373
5.08V
2 1.0A 5.07W/
6.48W
78.2% 0.430
5.07V
3 2.0A 10.1W/
13.0W
77.7% 0.470
5.04V

As always, we start with the standby load tests. Because this is a little guy with less capacity here than the ATX units I test, maintaining above average efficiency results and fantastic voltage readings is a bit easier.

On this one, I get an above excellent result of 0.8% when it comes to standby voltage regulation. Not too shabby, Shabba.

SS-350TGM TFX – Low Load Tests
Load
Level
+3.3V +5V +12V -12V 5VSB DC Watts/
AC Watts
P.F. Eff.
Load Tests
10.1% 1A 1A 1.8A 0.2A 0.5A 35.3W/
44.5W
0.961 79.3%
3.37V 5.03V 12.30V -11.35V 5.07V

Though this is an 80 Plus Gold certified unit, I was ready for an efficiency result like this one. All this pushing for higher efficiency between 20-100% loading means that the efficiency drop off common to all SMPS designs has to go somewhere, and it’s always going to go to the lower power levels like this. We have mediocre efficiency here, yes, but this doesn’t mean we’re always going to get results like this.

Let’s run the main tests and find out for sure, though.

SS-350TGM TFX – Cold Load Tests
Test # +3.3V +5V +12V1 +12V2 DC Watts/
AC Watts
AC
Input
Eff. P.F. Intake/
Exhaust
Progressive Load Tests
1 1A 1A 2.5A 2.5A 74.7W/
85.5W
120.5V 87.4% 0.984 25°C/
25°C*
3.37V 5.03V 12.29V 12.29V
2 2A 2A 5A 5A 145.6W/
161.1W
119.7V 90.4% 0.996 27°C/
27°C*
3.36V 5.02V 12.27V 12.27V
3 2.5A 2.5A 6A 6A 175.4W/
194.8W
120.2V 90.0% 0.997 25°C/
37 °C
3.36V 5.01V 12.26V 12.26V
4 4A 4A 10A 10A 287.7W/
323.5W
120.4V 88.9% 0.997 26°C/
35°C
3.34V 5.00V 12.22V 12.22V
5 5A 5A 12.5A 12A 353.2W/
401.6W
119.8V 87.9% 0.998 26°C/
35°C
3.33V 4.99V 12.21V 12.21V
Crossload Tests
CL1 9A 9A 0A 0A 79.8W/
93.4W
120.4V 85.4% 0.986 26°C/
36°C**
3.34V 4.99V 12.28V 12.28V
CL2 0A 0A 14.5A 14.5A 359.1W/
406.9W
118.8V 88.3% 0.997 26°C/
35°C
3.35V 5.02V 12.21V 12.21V

* Fanless operation.
** Intermittent fan operation.

Ah, yes… there’s your Gold efficiency right there. An easy pass on tests one, three, and five; just as I was hoping for. Very nice.

Let’s have a look at the voltage regulation now. Moving from left to right in the above table, I get 1.2%, 0.8%, 0.7%, and 0.7%. That gives us a most excellent average result of 0.85%, so it seems that Seasonic has brought their reputation for amazing voltage stability to this little guy. Awesome!

There’s really not too much else to say at this point in time. The fan stayed off until test three, and never got loud, but this unit is also running out in the open. It may become a different story in the hot box. Let’s go to the next page now.