Kingwin LZP-550 Lazer Platinum 550 W Review

Name: Kingwin LZP-550 Lazer Platinum 550 W
Brand: Kingwin

crmaris

on Jun 14th, 2011,

in Power Supplies.

Manufacturer: Kingwin

Value & Conclusion »

Ripple Measurements

In the following table you will find the ripple levels that we measured on the main rails of LZP-550. 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	10.4 mV	5.4 mV	5.6 mV	Pass
40% Load	12.4 mV	6.2 mV	7.2 mV	Pass
50% Load	14.6 mV	6.4 mV	8.2 mV	Pass
60% Load	15.8 mV	6.6 mV	8.4 mV	Pass
80% Load	19.2 mV	7.6 mV	9.8 mV	Pass
100% Load	23.2 mV	8.2 mV	11.0 mV	Pass
120% Load	27.8 mV	9.4 mV	12.4 mV	Pass
Crossload 1	13.2 mV	7.2 mV	8.4 mV	Pass
Crossload 2	21.6 mV	8.0 mV	9.2 mV	Pass

All rails registered very low ripple. Even when we "overclocked" the PSU with 100W more, ripple registered only a small increase overall. This clearly shows that this unit can handle 650W without any problems and Super Flower deliberately dropped it to 550W to meet Platinum requirements.

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.