Cooler Master V Series 550 W Review

Name: Cooler Master V Series 550 W
Brand: Cooler Master

crmaris

on Dec 14th, 2015,

in Power Supplies.

Manufacturer: Cooler Master

EMC Pre-Compliance Testing »

Ripple Measurements

You will see the ripple levels we measured on the 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 V550
Test	12 V	5 V	3.3 V	5VSB	Pass/Fail
10% Load	9.3 mV	4.5 mV	13.9 mV	3.9 mV	Pass
20% Load	9.3 mV	5.1 mV	15.5 mV	4.2 mV	Pass
30% Load	10.4 mV	4.9 mV	16.5 mV	4.9 mV	Pass
40% Load	12.1 mV	5.4 mV	18.4 mV	5.2 mV	Pass
50% Load	14.3 mV	5.9 mV	18.8 mV	5.5 mV	Pass
60% Load	16.4 mV	6.1 mV	19.1 mV	6.1 mV	Pass
70% Load	18.7 mV	6.4 mV	20.9 mV	6.9 mV	Pass
80% Load	20.3 mV	6.6 mV	22.4 mV	7.3 mV	Pass
90% Load	21.9 mV	7.2 mV	22.8 mV	7.6 mV	Pass
100% Load	24.7 mV	7.8 mV	25.6 mV	11.4 mV	Pass
110% Load	27.0 mV	8.3 mV	26.4 mV	9.2 mV	Pass
Crossload 1	11.9 mV	5.8 mV	17.9 mV	4.7 mV	Pass
Crossload 2	25.1 mV	8.0 mV	24.4 mV	7.7 mV	Pass

Ripple suppression at +12V, 5V and 5VSB was great and good-enough at 3.3V. Although it didn't do poorly, the 3.3V rail is this PSU's weak link considering its average overall performance.

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.