Seasonic X Series XM2 1250 W Review

Name: Seasonic X Series XM2 1250 W
Brand: Seasonic

crmaris

on Aug 20th, 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-1250XM2'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-1250XM2
Test	12 V	5 V	3.3 V	5VSB	Pass/Fail
10% Load	12.0 mV	10.5 mV	11.6 mV	7.8 mV	Pass
20% Load	14.8 mV	11.0 mV	13.9 mV	8.7 mV	Pass
30% Load	16.1 mV	13.2 mV	14.3 mV	10.7 mV	Pass
40% Load	16.8 mV	14.8 mV	16.6 mV	12.2 mV	Pass
50% Load	18.6 mV	13.3 mV	17.1 mV	14.4 mV	Pass
60% Load	21.7 mV	14.6 mV	17.8 mV	17.3 mV	Pass
70% Load	25.3 mV	17.1 mV	19.7 mV	19.7 mV	Pass
80% Load	27.9 mV	19.4 mV	22.3 mV	21.4 mV	Pass
90% Load	31.1 mV	21.4 mV	23.5 mV	24.1 mV	Pass
100% Load	35.1 mV	23.2 mV	26.4 mV	27.0 mV	Pass
110% Load	39.7 mV	23.9 mV	28.6 mV	28.3 mV	Pass
Crossload 1	14.6 mV	15.5 mV	19.2 mV	27.9 mV	Pass
Crossload 2	35.5 mV	18.8 mV	27.8 mV	26.6 mV	Pass

Ripple suppression was very good on all rails, but we can't call it amazing since we have seen similar units register much lower ripple in our testing environment. Seasonic surely did a great job here, but we think that they should strive to meet the ripple results of competing products if they want their units to place at the top of our performance graph.

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.