Ripple MeasurementsIn 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).