Corsair RM850x (2018) PSU Review

Crmaris September 28, 2018 Featured Tech News, Featured Tech Reviews, Power Supplies, Reviews

To learn how we measure ripple, please click here.

The following table includes the ripple levels we measured on the RM850x’s rails. The limits, according to the ATX specification, are 120mV (+12V) and 50mV (5V, 3.3V, and 5VSB).

Test	12V	5V	3.3V	5VSB	Pass/Fail
10% Load	1.6 mV	3.8 mV	2.8 mV	1.9 mV	Pass
20% Load	8.0 mV	5.0 mV	4.8 mV	3.5 mV	Pass
30% Load	6.6 mV	4.3 mV	3.2 mV	2.4 mV	Pass
40% Load	5.9 mV	5.7 mV	5.3 mV	3.7 mV	Pass
50% Load	5.7 mV	5.8 mV	5.0 mV	3.6 mV	Pass
60% Load	6.2 mV	5.5 mV	4.4 mV	3.4 mV	Pass
70% Load	6.2 mV	8.1 mV	5.7 mV	5.6 mV	Pass
80% Load	6.3 mV	6.4 mV	5.9 mV	4.1 mV	Pass
90% Load	7.0 mV	7.2 mV	6.9 mV	5.1 mV	Pass
100% Load	7.2 mV	8.5 mV	7.2 mV	5.7 mV	Pass
110% Load	7.3 mV	8.4 mV	6.4 mV	5.7 mV	Pass
Crossload 1	7.0 mV	7.3 mV	6.5 mV	3.3 mV	Pass
Crossload 2	6.9 mV	6.1 mV	4.0 mV	4.2 mV	Pass

The ripple suppression is amazing! The combination of a good design and the in-cable caps makes wonders.

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.