OCZ ZX Series 850 W Review

Name: OCZ ZX Series 850 W
Brand: OCZ

crmaris

on May 23rd, 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 Series 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	14.2 mV	7.2 mV	7.0 mV	Pass
40% Load	20.6 mV	8.6 mV	7.2 mV	Pass
50% Load	25.2 mV	9.2 mV	7.6 mV	Pass
60% Load	30.2 mV	10.2 mV	7.6 mV	Pass
80% Load	41.0 mV	11.8 mV	8.8 mV	Pass
100% Load	52.4 mV	13.2 mV	10.2 mV	Pass
Crossload 1	18.8 mV	10.4 mV	9.8 mV	Pass
Crossload 2	51.8 mV	13.4 mV	10.8 mV	Pass

Ripple/noise suppression on the minor rails is great. At +12V is good enough but surely not among the best we have seen. The ZX 1250W, although it has a much stronger +12V rail, exhibited way lower ripple on this rail. It seems that ZX 850W uses less filtering capacitors or/and more noisy mosfets.

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.