Reviews - Seasonic X-750 750W
Sample Provided by: (By OklahomaWolf on Sat, Jul-10-2010)

Page 3 -

And now we get to roast our unit in the hot box. As you will recall, the hot box gets all its heat from the SunMoon itself, via a little dryer duct running between them. It has three fans in it - one to help pull air through the duct, one for exhaust, and one for intake. Because this thing can heat up to over fifty degrees, I'm going to turn on the exhaust fan. But, because I'm a sadistic so and so who loves to hear power supplies scream, I'll leave the intake fan off.

Results from Seasonic SS-750KM HOT load tests
Test # +3.3V +5V +12V DC Watts/
AC Watts
Eff. Intake/
Exhaust
Simulated system load tests
Test
1
1.5A 1.5A 11A 153W/
171W
89.5% 28°C/
30°C
3.36V 5.02V 12.30V
Test
2
3A 3A 22A 302W/
331W
91.2% 34°C/
40°C
3.34V 5.00V 12.25V
Test
3
4A 4A 33A 446W/
496W
89.9% 38°C/
42°C
3.32V 4.98V 12.20V
Test
4
5.5A 5.5A 45A 605W/
679W
89.1% 43°C/
49°C
3.30V 4.96V 12.15V
Test
5
7A 7A 56A 752W/
864W
87.0% 48°C/
58°C
3.28V 4.93V 12.09V
Test
CL1
15A 15A 1A 141W/
167W
84.4% 33°C/
41°C
3.32V 4.96V 12.32V
Test
CL2
0A 0A 62A 755W/
862W
87.6% 46°C/
54°C
3.30V 4.97V 12.09V

Folks, the hot box takes no prisoners. The X-750 just barely met Gold in these tests, dropping down to 87% on the nose in test five. That's where the minimum for Gold is at. This is a direct result of the ambient temperature reaching a toasty forty-eight degrees. The rest of the numbers are pretty close to the cold test results, which one would expect from a unit that isn't quite being roasted alive just yet.

The voltage regulation numbers are also no big surprise. In the hot box, the unit doesn't regulate as well as it did cold. Again, this is the result of all the heat. Most units perform worse overall in the hot box compared to the cold tests.

Let's move down and let the Tek give us the scope shots.

Oscilloscope Measurements - Seasonic SS-750KM

Test #
+3.3V
+5V
+12V
Test
1
Test
2
Test
3
Test
4
Test
5
Test
CL1
Test
CL2

Now this is what I like to see. Even though the overshoot transient tests were disappointing, these shots are the exact opposite. The 12V rail hit 20mV of ripple at worst, while the 3.3V and 5V rails came in at 26mV and 22mV respectively. Like the X-650, this unit simply excels here, and is among the best I've tested. Seasonic can be very proud of these results.



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