Riotoro Enigma 850W PSU Review

Ripple Measurements

To learn how we measure ripple, please click here.

The following table includes the ripple levels we measured on the Enigma 850 's rails. The limits, according to the ATX specification, are 120mV (+12V) and 50mV (5V, 3.3V, and 5VSB).

Test12V5V3.3V5VSBPass/Fail
10% Load22.8mV4.1mV5.5mV10.9mVPass
20% Load20.5mV4.8mV5.2mV11.6mVPass
30% Load21.1mV5.3mV5.6mV15.2mVPass
40% Load23.0mV6.3mV6.3mV15.4mVPass
50% Load26.9mV7.7mV7.9mV15.4mVPass
60% Load30.6mV8.6mV14.3mV16.5mVPass
70% Load34.7mV10.3mV17.1mV17.6mVPass
80% Load40.2mV11.0mV16.6mV18.7mVPass
90% Load45.3mV11.4mV13.9mV19.2mVPass
100% Load52.5mV12.7mV14.0mV23.8mVPass
110% Load57.5mV14.5mV14.6mV23.2mVPass
Cross-Load 125.1mV6.9mV7.6mV11.7mVPass
Cross-Load 252.5mV12.2mV11.7mV15.7mVPass

While ripple suppression at +12V is decent, it would be much better if it stayed below 45-50mV under the worst-case scenario. Fortunately, ripple suppression on the minor rails is excellent.

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 0.01 V/Div (each vertical division/box equals 0.01V) as the standard for all measurements.

Ripple At Full Load

Ripple At 110-Percent Load

Ripple At Cross-Load 1

Ripple At Cross-Load 2

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  • WhyAreYou
    Great review!