Cougar GX-F Series 750W Review

Name: Cougar GX-F Series 750W
Brand: Cougar

crmaris

on May 23rd, 2018,

in Power Supplies.

Manufacturer: Cougar

Protection Features Evaluation »

Ripple Measurements

You will see the ripple levels we measured on the rails of the GX-F750 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 - Cougar GX-F750
Test	12 V	5 V	3.3 V	5VSB	Pass/Fail
10% Load	8.4 mV	14.0 mV	14.7 mV	9.4 mV	Pass
20% Load	14.1 mV	12.8 mV	15.1 mV	10.3 mV	Pass
30% Load	13.8 mV	13.7 mV	16.6 mV	12.6 mV	Pass
40% Load	15.2 mV	14.5 mV	18.4 mV	14.5 mV	Pass
50% Load	17.6 mV	16.0 mV	21.0 mV	17.2 mV	Pass
60% Load	18.2 mV	16.6 mV	22.4 mV	19.2 mV	Pass
70% Load	20.2 mV	17.6 mV	24.9 mV	21.7 mV	Pass
80% Load	21.1 mV	17.6 mV	24.9 mV	29.1 mV	Pass
90% Load	22.7 mV	19.7 mV	26.7 mV	30.7 mV	Pass
100% Load	24.9 mV	21.3 mV	33.5 mV	29.2 mV	Pass
110% Load	27.4 mV	25.6 mV	32.9 mV	30.9 mV	Pass
Crossload 1	15.2 mV	12.1 mV	15.9 mV	7.3 mV	Pass
Crossload 2	25.0 mV	21.8 mV	27.8 mV	24.5 mV	Pass

Ripple is pretty low at +12V, which is the rail that matters the most. On the 5V and 5VSB rails, ripple suppression is good as well, but definitely not top-notch, and we would like to see the 3.3V rail stay below 30 mV at all times.

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.