OCZ ZX Series 1250 W Review

Name: OCZ ZX Series 1250 W
Brand: OCZ

crmaris

on Apr 21st, 2011,

in Power Supplies.

Manufacturer: OCZ

Value & Conclusion »

Ripple Measurements

In the following table you will find the ripple levels that we measured on the main rails of ZX 1250W. According to ATX specification the limits are 120 mV (+12V) and 50 mV (5V & 3.3V).

Ripple Measurements
Test	12 V	5 V	3.3 V	Pass/Fail
20% Load	9.2 mV	6.4 mV	5.6 mV	Pass
40% Load	15.6 mV	9.2 mV	9.0 mV	Pass
50% Load	16.4 mV	9.8 mV	10.6 mV	Pass
60% Load	17.2 mV	10.2 mV	10.8 mV	Pass
80% Load	22.6 mV	10.8 mV	12.2 mV	Pass
100% Load	29.4 mV	11.2 mV	13.2 mV	Pass
Crossload 1	19.2 mV	8.6 mV	8.2 mV	Pass
Crossload 2	31.6 mV	10.8 mV	13.6 mV	Pass

Ripple suppression is outstanding. Even with full load, ripple at +12V doesn't exceed the 1/4^th limit defined by ATX. On the minor rails ripple levels are also very low and do not exceed 14 mV in any test. It is indeed very impressive to see a PSU delivering over 1250W of power at above 50°C ambient and at the same time registering such low ripple.

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). 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 to 0.01V) as standard but sometimes we are forced to use 0.02 V/Div, meaning that the fluctuations will look smaller but actually this wont be the case.