Be Quiet Dark Power Pro 10 550 W Review

Name: Be Quiet Dark Power Pro 10 550 W
Brand: be quiet!

crmaris

on May 29th, 2012,

in Power Supplies.

Manufacturer: be quiet!

Performance Rating & Performance per Dollar »

Ripple Measurements

In the following table you will find the ripple levels that we measured on the main rails of P10-PRO-550W. According to ATX specification the limits are 120 mV (+12V) and 50 mV (5V, 3.3V and 5VSB).

Ripple Measurements Be Quiet P10-PRO-550W
Test	12 V	5 V	3.3 V	5VSB	Pass/Fail
20% Load	32.8 mV	7.4 mV	8.8 mV	10.5 mV	Pass
40% Load	36.6 mV	8.3 mV	9.0 mV	11.2 mV	Pass
50% Load	40.9 mV	8.5 mV	9.7 mV	12.8 mV	Pass
60% Load	38.1 mV	8.6 mV	10.5 mV	13.6 mV	Pass
80% Load	40.3 mV	10.4 mV	12.9 mV	14.9 mV	Pass
100% Load	47.4 mV	10.7 mV	13.8 mV	15.2 mV	Pass
Crossload 1	29.4 mV	6.1 mV	11.1 mV	8.6 mV	Pass
Crossload 2	46.1 mV	9.7 mV	11.2 mV	13.9 mV	Pass

Ripple suppression on the minor rails and at 5VSB is very good. Unfortunately right from the start the 12V line registered rather high ripple and at full load it peaked at 47.4mV. Surely this level of ripple is far from the 120mV limit that the ATX spec sets and in a regular PSU it cannot be considered as a high reading, but in a high-end unit like this one we expected below 40mV ripple at +12V and ideally below 30mV.

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.