Cooler Master Silent Pro M2 850 W Review

Name: Cooler Master Silent Pro M2 850 W
Brand: Cooler Master

crmaris

on Aug 19th, 2012,

in Power Supplies.

Manufacturer: Cooler Master

Performance Rating & Performance per Dollar »

Ripple Measurements

In the following table, you will see the ripple levels that we measured on the main rails of the Silent Pro M2 850 W. According to the ATX specification, the limits are 120 mV (+12V) and 50 mV (5V, 3.3V, and 5VSB).

Ripple Measurements Cooler Master RS-850-SPM2
Test	12 V	5 V	3.3 V	5VSB	Pass/Fail
20% Load	29.1 mV	8.6 mV	7.2 mV	6.0 mV	Pass
40% Load	44.8 mV	12.1 mV	7.2 mV	6.4 mV	Pass
50% Load	49.9 mV	14.1 mV	7.6 mV	7.7 mV	Pass
60% Load	54.2 mV	17.0 mV	7.9 mV	7.8 mV	Pass
80% Load	67.5 mV	20.4 mV	9.5 mV	8.7 mV	Pass
100% Load	85.2 mV	22.5 mV	10.7 mV	10.1 mV	Pass
Crossload 1	27.8 mV	20.6 mV	7.7 mV	6.4 mV	Pass
Crossload 2	84.9 mV	8.2 mV	9.3 mV	7.9 mV	Pass

Ripple suppression on the minor rails and at 5VSB is very good, but this is unfortunately not the case for the most important +12V rail. On the latter, ripple exceeded 80 mV during full load and CL2 tests, a reading that we rarely see with good quality units. As it seems, Enhance needs to improve the +12V filtering stage in order to restrict the ripple at much lower levels (<50 mV).

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 0.01 V) as the standard.