Seasonic X Series XM2 1050 W Review

Name: Seasonic X Series XM2 1050 W
Brand: Seasonic

crmaris

on Dec 4th, 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 SS-1050XM2's rails 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 SS-1050XM2
Test	12 V	5 V	3.3 V	5VSB	Pass/Fail
10% Load	14.0 mV	11.5 mV	16.0 mV	6.6 mV	Pass
20% Load	18.2 mV	12.0 mV	15.7 mV	7.3 mV	Pass
30% Load	18.5 mV	12.5 mV	18.2 mV	8.6 mV	Pass
40% Load	18.0 mV	14.6 mV	18.5 mV	9.3 mV	Pass
50% Load	18.9 mV	14.0 mV	19.7 mV	10.6 mV	Pass
60% Load	21.0 mV	14.8 mV	19.4 mV	11.3 mV	Pass
70% Load	23.8 mV	15.5 mV	20.7 mV	12.7 mV	Pass
80% Load	26.6 mV	17.5 mV	21.0 mV	13.8 mV	Pass
90% Load	28.7 mV	18.4 mV	26.1 mV	15.6 mV	Pass
100% Load	31.9 mV	19.0 mV	23.9 mV	17.0 mV	Pass
110% Load	36.9 mV	20.1 mV	24.6 mV	18.5 mV	Pass
Crossload 1	17.8 mV	15.3 mV	17.9 mV	6.3 mV	Pass
Crossload 2	32.7 mV	18.8 mV	22.4 mV	17.1 mV	Pass

Ripple suppression was very good overall and great on +12V, the rail that matters the most nowadays. There are surely platforms that deliver even lower ripple levels on their outputs, which doesn't diminish the SS-1050XM2's performance. It, however, would have been nice to see Seasonic closely trail and, why not, also beat the competition in ripple suppression.

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.