Cooler Master V Series 650 W Review

Name: Cooler Master V Series 650 W
Brand: Cooler Master

crmaris

on Mar 24th, 2016,

in Power Supplies.

Manufacturer: Cooler Master

EMC Pre-Compliance Testing »

Ripple Measurements

You will see the ripple levels we measured on the V650'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 - Cooler Master V650
Test	12 V	5 V	3.3 V	5VSB	Pass/Fail
10% Load	5.4 mV	4.5 mV	12.0 mV	4.6 mV	Pass
20% Load	6.6 mV	4.4 mV	12.5 mV	5.0 mV	Pass
30% Load	18.3 mV	4.9 mV	14.1 mV	5.7 mV	Pass
40% Load	17.6 mV	5.1 mV	15.6 mV	6.2 mV	Pass
50% Load	19.9 mV	5.7 mV	17.1 mV	7.4 mV	Pass
60% Load	22.3 mV	6.6 mV	18.1 mV	8.1 mV	Pass
70% Load	25.1 mV	6.6 mV	18.4 mV	9.0 mV	Pass
80% Load	27.6 mV	7.4 mV	20.2 mV	10.4 mV	Pass
90% Load	30.1 mV	8.5 mV	20.5 mV	11.1 mV	Pass
100% Load	33.1 mV	9.5 mV	24.0 mV	12.3 mV	Pass
110% Load	35.7 mV	10.2 mV	24.3 mV	14.0 mV	Pass
Crossload 1	8.0 mV	4.8 mV	14.5 mV	4.6 mV	Pass
Crossload 2	32.9 mV	8.8 mV	23.9 mV	12.2 mV	Pass

Ripple suppression is pretty good overall, especially on the +12V, 5V, and 5VSB rails. Only 3.3V exceeded 20 mV, which still isn't even half of the corresponding ATX limit.

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 of these measurements.