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Fractal Design Edison M Series 750W Power Supply Review

Ripple Measurements

Ripple Measurements

To learn how we measure ripple, please click here.

The following table includes the ripple levels we measured on the Edison M 750's rails. The limits are, according to the ATX specifications, 120mV (+12V) and 50mV (5V, 3.3V and 5VSB).

Test12V (mV)5V (mV)3.3V (mV)5VSB (mV)Pass/Fail
10% Load6.456.35.4Pass
20% Load8.84.26.46.6Pass
30% Load10.856.77.6Pass
40% Load13.259.68.2Pass
50% Load155.6109.4Pass
60% Load19.15.512.310.2Pass
70% Load22.511.812.711.8Pass
80% Load25.735.814.212.4Pass
90% Load29.934.91713.9Pass
100% Load34.637.619.115.2Pass
110% Load40.140.719.316.2Pass
Crossload 17.75.47.411.1Pass
Crossload 233.13414.214Pass
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Ripple suppression on all rails (except for 5V) is very good overall. On the 5V rail, we noticed a sudden increase in ripple with 80-percent load and up. Incidentally, this was also the case with the Edison M 650W that we tested previously. We would advise Seasonic to look at the DC-DC converter that generates the 5V rail to find the source of this sudden increase at higher loads. It might not be a serious problem that could affect your system’s stability, since ripple on this rail is still lower than the ATX limit. But it's still a shame to see performance loss over this matter.

Ripple Oscilloscope Screenshots

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

Ripple At Full Load

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Ripple At 110-Percent Load

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Ripple At Cross-Load 1

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Ripple At Cross-Load 2

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