Seasonic G Series V2 550 W Review

Name: Seasonic G Series V2 550 W
Brand: Seasonic

crmaris

on May 14th, 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 G-550 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-550RM-V2
Test	12 V	5 V	3.3 V	5VSB	Pass/Fail
10% Load	6.3 mV	5.0 mV	9.8 mV	6.5 mV	Pass
20% Load	7.9 mV	5.3 mV	10.5 mV	7.1 mV	Pass
30% Load	9.6 mV	5.5 mV	10.6 mV	8.7 mV	Pass
40% Load	12.4 mV	5.9 mV	11.1 mV	8.8 mV	Pass
50% Load	13.8 mV	5.7 mV	11.3 mV	9.3 mV	Pass
60% Load	16.9 mV	11.2 mV	11.4 mV	10.4 mV	Pass
70% Load	19.5 mV	13.2 mV	12.2 mV	10.9 mV	Pass
80% Load	22.0 mV	14.5 mV	12.6 mV	11.6 mV	Pass
90% Load	25.3 mV	15.5 mV	13.2 mV	12.5 mV	Pass
100% Load	28.6 mV	18.0 mV	13.5 mV	13.5 mV	Pass
110% Load	34.8 mV	19.4 mV	12.9 mV	15.1 mV	Pass
Crossload 1	8.4 mV	6.6 mV	11.9 mV	12.2 mV	Pass
Crossload 2	27.5 mV	16.1 mV	13.7 mV	12.4 mV	Pass

Ripple suppression was great on all rails, which we have come to expect from a Seasonic product. On the +12V rail, the G-550 managed to stay below one-fourth of the limit, and the other rails performed equally well.

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.