Be Quiet! Pure Power CM L8 730 W Review

Name: Be Quiet! Pure Power CM L8 730 W
Brand: be quiet!

crmaris

on Sep 15th, 2011,

in Power Supplies.

Manufacturer: be quiet!

Value & Conclusion »

Ripple Measurements

In the following table you will find the ripple levels that we measured on the main rails of L8-730W. According to ATX specification the limits are 120 mV (+12V) and 50 mV (5V, 3.3V and 5VSB).

Ripple Measurements Be Quiet L8-730W
Test	12 V	5 V	3.3 V	5VSB	Pass/Fail
20% Load	6.7 mV	5.7 mV	3.2 mV	7.1 mV	Pass
40% Load	9.2 mV	8.1 mV	3.5 mV	9.2 mV	Pass
50% Load	12.5 mV	11.4 mV	5.0 mV	9.5 mV	Pass
60% Load	15.7 mV	13.8 mV	5.5 mV	13.3 mV	Pass
80% Load	24.3 mV	18.9 mV	8.4 mV	13.5 mV	Pass
100% Load	31.2 mV	21.8 mV	10.2 mV	18.4 mV	Pass
Crossload 1	9.4 mV	13.3 mV	4.8 mV	7.4 mV	Pass
Crossload 2	31.9 mV	16.3 mV	9.1 mV	8.8 mV	Pass

Ripple is very low on all rails and loads. HEC did an excellent job in ripple suppression and managed to get rid of the ripple curse that troubled most of their products. As you can see, even at full load, ripple at +12V is a little over 30 mV (a quarter of the limit) and on the minor rails and 5VSB is pretty low too.

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.