PC Power & Cooling Silencer MK III 400 W Review

Name: PC Power & Cooling Silencer MK III 400 W
Brand: PC Power & Cooling

crmaris

on Nov 30th, 2011,

in Power Supplies.

Manufacturer: PC Power & Cooling

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 MK3S400. According to ATX specification the limits are 120 mV (+12V) and 50 mV (5V, 3.3V and 5VSB).

Ripple Measurements PC Power & Cooling Silencer MK3S400
Test	12 V	5 V	3.3 V	5VSB	Pass/Fail
20% Load	4.8 mV	5.4 mV	4.1 mV	6.3 mV	Pass
40% Load	7.1 mV	7.2 mV	6.4 mV	8.9 mV	Pass
50% Load	7.3 mV	8.6 mV	7.1 mV	9.0 mV	Pass
60% Load	7.9 mV	8.8 mV	7.4 mV	10.9 mV	Pass
80% Load	8.9 mV	11.4 mV	10.0 mV	11.1 mV	Pass
100% Load	10.9 mV	15.2 mV	15.8 mV	12.8 mV	Pass
Crossload 1	10.6 mV	24.2 mV	9.7 mV	6.5 mV	Pass
Crossload 2	11.2 mV	11.3 mV	11.5 mV	8.5 mV	Pass

Ripple suppression clearly is the strong point of this unit. Even at full load and with near 50°C ambient, ripple on all rails is minimal. Only at CL1 test the 5V rail shows a sign of stress since ripple drastically increases compared to full load test, without surpassing however the half of the ATX limit (50mV). All in all this level of ripple suppression easily puts the MK3S400 in the high-end category.

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.