XFX ProSeries 1250 W Review

Name: XFX ProSeries 1250 W
Brand: XFX

crmaris

on Jan 20th, 2012,

in Power Supplies.

Manufacturer: XFX

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 XFX Pro 1250W. According to ATX specification the limits are 120 mV (+12V) and 50 mV (5V, 3.3V and 5VSB).

Ripple Measurements XFX P1-1250-BEFX
Test	12 V	5 V	3.3 V	5VSB	Pass/Fail
20% Load	19.3 mV	12.9 mV	16.8 mV	22.0 mV	Pass
40% Load	16.6 mV	15.0 mV	17.1 mV	9.1 mV	Pass
50% Load	17.1 mV	12.2 mV	13.5 mV	9.3 mV	Pass
60% Load	17.2 mV	13.7 mV	13.7 mV	10.5 mV	Pass
80% Load	21.4 mV	20.9 mV	16.9 mV	13.2 mV	Pass
100% Load	33.6 mV	28.7 mV	24.9 mV	24.9 mV	Pass
Crossload 1	25.3 mV	12.2 mV	13.7 mV	19.8 mV	Pass
Crossload 2	34.0 mV	29.9 mV	17.1 mV	29.9 mV	Pass

As expected, ripple suppression is excellent, especially at +12V where ripple does not exceed 34mV even at full load and at 50°C ambient. With 20% load ripple at +12V and 5VSB is increased, compared to the other tests and taking into account the low load level of course. For +12V most likely the PWM operation at low loads is responsible for this behavior.

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.