Corsair Professional Series Gold AX 650 W Review

Name: Corsair Professional Series Gold AX 650 W
Brand: Corsair

crmaris

on Jan 4th, 2012,

in Power Supplies.

Manufacturer: Corsair

Performance Rating & Performance per Dollar »

Ripple Measurements

In the following table you will find the ripple levels that we measured on the main rails of AX650. According to ATX specification the limits are 120 mV (+12V) and 50 mV (5V, 3.3V and 5VSB).

Ripple Measurements Corsair CMPSU-650AX
Test	12 V	5 V	3.3 V	5VSB	Pass/Fail
20% Load	5.6 mV	9.7 mV	6.7 mV	18.7 mV	Pass
40% Load	18.8 mV	10.4 mV	7.1 mV	4.2 mV	Pass
50% Load	17.1 mV	10.6 mV	8.0 mV	4.9 mV	Pass
60% Load	15.6 mV	10.9 mV	8.0 mV	5.8 mV	Pass
80% Load	14.5 mV	13.7 mV	8.2 mV	6.9 mV	Pass
100% Load	14.9 mV	14.8 mV	8.7 mV	7.7 mV	Pass
Crossload 1	25.8 mV	13.5 mV	7.7 mV	18.4 mV	Pass
Crossload 2	15.2 mV	10.3 mV	7.0 mV	24.4 mV	Pass

Ripple suppression is excellent, as we expected from a Seasonic product. As you can see with 40% load ripple peaks at +12V and afterwards it starts to decrease. Most likely this weird behavior has to do with the PWM operation at lower loads while at higher loads the main choppers operate in FM mode. Also with 20% load ripple at 5VSB is high, compared to the readings of this rail at the other tests of course since 18.7mV of ripple cannot be classified as high, but afterwards it drops dead low. Overall the AX650 delivers very clean DC outputs.

Ripple at Full Load

In the following oscilloscope screenshots you can see the AC ripple and noise that the main rails registered (+12V, 5V, 3.3V and 5VSB). The bigger the fluctuations on the oscilloscope's screen the bigger the ripple/noise. For all measurements we set 0.01 V/Div (each vertical division/box equals to 0.01V) as standard.