Enermax Platimax 850 W Review

Name: Enermax Platimax 850 W
Brand: Enermax

crmaris

on Oct 7th, 2011,

in Power Supplies.

Manufacturer: Enermax

Value & Conclusion »

Ripple Measurements

In the following table you will find the ripple levels that we measured on the main rails of EPM850EWT. According to ATX specification the limits are 120 mV (+12V) and 50 mV (5V, 3.3V and 5VSB).

Ripple Measurements Emermax EPM850EWT
Test	12 V	5 V	3.3 V	5VSB	Pass/Fail
20% Load	23.5 mV	8.7 mV	13.5 mV	12.0 mV	Pass
40% Load	33.8 mV	11.6 mV	16.6 mV	14.3 mV	Pass
50% Load	34.2 mV	12.0 mV	19.4 mV	16.5 mV	Pass
60% Load	36.3 mV	15.0 mV	19.7 mV	18.9 mV	Pass
80% Load	39.7 mV	15.5 mV	22.1 mV	19.4 mV	Pass
100% Load	45.1 mV	19.5 mV	25.1 mV	21.5 mV	Pass
Crossload 1	34.1 mV	15.6 mV	20.0 mV	14.3 mV	Pass
Crossload 2	39.9 mV	13.5 mV	18.4 mV	20.5 mV	Pass

Ripple suppression is good however we cannot classify it among the best we have ever seen and to be frank we expected to see lower ripple in a PSU of this category, especially at +12V which is of most importance. To be perfectly clear, we don't find bad or even mediocre performance on the Platimax 850 W. It's just that the competition (e.g. Corsair AX850) offers much lower ripple and we wanted to see similar top performance here.

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.