OCZ Fatal1ty 550 W Review

Name: OCZ Fatal1ty 550 W
Brand: OCZ

crmaris

on Nov 3rd, 2013,

in Power Supplies.

Manufacturer: OCZ

Performance Rating, Performance per Dollar & Noise Rating »

Ripple Measurements

You will see the ripple levels that we measured on the main rails of the FTY550W 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 OCZ Fatal1ty 550W
Test	12 V	5 V	3.3 V	5VSB	Pass/Fail
20% Load	21.5 mV	14.5 mV	13.4 mV	10.3 mV	Pass
40% Load	24.0 mV	18.3 mV	15.2 mV	13.4 mV	Pass
50% Load	27.8 mV	20.8 mV	16.6 mV	15.2 mV	Pass
60% Load	24.3 mV	20.7 mV	16.1 mV	17.9 mV	Pass
80% Load	30.8 mV	26.1 mV	19.1 mV	23.0 mV	Pass
100% Load	32.6 mV	29.9 mV	20.9 mV	29.7 mV	Pass
110% Load	42.3 mV	34.2 mV	22.6 mV	32.8 mV	Pass
Crossload 1	33.5 mV	83.1 mV	23.2 mV	7.6 mV	Fail
Crossload 2	39.7 mV	33.7 mV	25.2 mV	29.7 mV	Pass

Ripple suppression on the +12V rail was excellent and good on the other rails, especially if we take into account that this is a mainstream PSU. The bad news start with the CL1 test where the unit clearly shows its weakness in handling the loads we applied to its rails. The 5V rail registered high ripple that exceeded the corresponding limit of the ATX spec, so the PSU failed to pass that test. We are pretty sure that changing the conditions of this specific test by dialing up the load at +12V would have allowed the 5V rail to be in control, but Intel states that load at +12V must be minimal while the other minor rails handle as much as possible.

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. For all measurements, we set 0.01 V/Div (each vertical division/box equals 0.01 V) as standard.