Seasonic PRIME 1200 Platinum Power Supply

REVIEW INFORMATION
SUPPLIED BY: Seasonic USA
MANUFACTURER: Seasonic
PRODUCT: PRIME 1200 Platinum
PROD LINK: PRIME Platinum Product Page
PRICE: $229.90 @ Amazon
Price is at the time of testing!


PRIME 1200 Platinum – Overshoot Transient Tests
VSB On VSB to 100%, 12V Off to 100%, 12V
O-Scope Shot O-Scope Shot O-Scope Shot

And… nope, this unit looks just like the Titanium models. That’s unfortunate. The standby rail is just fine, but the 12V side of things isn’t smooth or continuous. So, half the point will be leaving on the last page.

Time to do some hot testing.

PRIME 1200 Platinum – Hot Load Tests
Test # +3.3V +5V +12V DC Watts/
AC Watts
AC
Input
Eff. P.F. Intake/
Exhaust
Progressive Load Tests
1 1A 1A 8.9A 120.9W/
139.7W
117.6V 86.6% 0.981 30°C/
31°C*
3.306V 4.99V 12.11V
2 1.5A 1.5A 19A 249.7W/
273.9W
117.7V 91.2% 0.985 32°C/
38°C*
3.306V 4.99V 12.10V
3 3.5A 3.5A 47A 607.1W/
662.1W
116.2V 91.7% 0.996 37°C/
47°C
3.303V 4.99V 12.09V
4 5A 5A 70A 899.3W/
996.6W
114.4V 90.2% 0.997 42°C/
54°C
3.299V 4.98V 12.08V
5 7A 7A 93.5A 1204.5W/
1361W
113.7V 88.5% 0.998 47°C/
67°C
3.294V 4.98V 12.08V
Crossload Tests
CL1 15A 15A 0A 129.0W/
154.9W
117.6V 83.3% 0.985 32°C/
39°C
3.296V 4.98V 12.11V
CL2 0A 0A 100A 1212.9W/
1366W
114.9V 88.8% 0.998 46°C/
64°C
3.307V 5.00V 12.08V

* Fanless operation.

It’s not too often a unit comes in here and nails the same regulation in the hot tests as the cold tests, but here we are today looking at just that. Awesome! And at the mythic level, too! If only the MIJ unit had done this, huh? No disputing Seasonic is still the master, here, with relatively few other companies competing.

Efficiency was still a bit of a struggle in test three for Platinum, but it does clear once again and all looks fantastic.

Yeah, the fan got loud again. Let’s see the scope shots.

PRIME 1200 Platinum – Oscilloscope
Test # +3.3V +5V +12V
1 O-Scope Shot O-Scope Shot O-Scope Shot
2 O-Scope Shot O-Scope Shot O-Scope Shot
3 O-Scope Shot O-Scope Shot O-Scope Shot
4 O-Scope Shot O-Scope Shot O-Scope Shot
5 O-Scope Shot O-Scope Shot O-Scope Shot
CL1 O-Scope Shot O-Scope Shot O-Scope Shot
CL2 O-Scope Shot O-Scope Shot O-Scope Shot

Eeeeexcellent. Not that I expected any less. Though this model does have in cable capacitors helping out, it does manage some nice readings here so I reckon they can stay. I’m still going to score against those, though.

The ripple itself runs about 15mV max for the 3.3V, 16mV for the 5V, and 20mV for the 12V. Nothing to complain about there.