Seasonic S12G 450 W Review

Name: Seasonic S12G 450 W
Brand: Seasonic

crmaris

on Apr 2nd, 2014,

in Power Supplies.

Manufacturer: Seasonic

Performance Rating, Performance per Dollar, Noise & Efficiency Rating »

Ripple Measurements

You will see the ripple levels we measured on the rails of the S12G-450 in the following table. The limits are, according to the ATX specification, 120 mV (+12V) and 50 mV (5V, 3.3V, and 5VSB).

Ripple Measurements - Seasonic SSR-450RT
Test	12 V	5 V	3.3 V	5VSB	Pass/Fail
20% Load	10.7 mV	7.1 mV	9.1 mV	8.2 mV	Pass
40% Load	14.9 mV	7.4 mV	9.4 mV	9.9 mV	Pass
50% Load	17.7 mV	8.0 mV	10.0 mV	10.9 mV	Pass
60% Load	19.9 mV	10.1 mV	10.8 mV	11.1 mV	Pass
80% Load	27.4 mV	14.7 mV	11.4 mV	12.8 mV	Pass
100% Load	34.2 mV	18.0 mV	12.3 mV	14.5 mV	Pass
110% Load	37.5 mV	18.8 mV	12.4 mV	15.3 mV	Pass
Crossload 1	12.0 mV	9.0 mV	10.5 mV	11.3 mV	Pass
Crossload 2	33.2 mV	18.0 mV	13.0 mV	13.0 mV	Pass

Ripple suppression was excellent on all rails, and we don't expect anything less from a Seasonic product. Ripple on the +12V rail stayed below 40 mV with even 110% of the maximum-capacity-load and at operating temperatures exceeding 45°C; we can't expect more from a mainstream unit.

Ripple at Full Load

You can see the AC ripple and noise the main rails registered (+12V, 5V, 3.3V, and 5VSB) in the following oscilloscope screenshots. The bigger the fluctuations on the oscilloscope's screen, the bigger the ripple/noise. We set 0.01 V/Div (each vertical division/box equals 0.01 V) as the standard for all measurements.