Enermax Platimax 1200 W Review

Name: Enermax Platimax 1200 W
Brand: Enermax

crmaris

on Feb 1st, 2012,

in Power Supplies.

Manufacturer: Enermax

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 EPM1200EWT. According to ATX specification the limits are 120 mV (+12V) and 50 mV (5V, 3.3V and 5VSB).

Ripple Measurements Enermax EPM1200EWT
Test	12 V	5 V	3.3 V	5VSB	Pass/Fail
20% Load	12.1 mV	17.8 mV	15.4 mV	10.3 mV	Pass
40% Load	16.0 mV	20.6 mV	18.3 mV	12.2 mV	Pass
50% Load	18.3 mV	21.4 mV	19.4 mV	13.7 mV	Pass
60% Load	19.4 mV	23.4 mV	22.0 mV	14.9 mV	Pass
80% Load	23.7 mV	28.3 mV	23.6 mV	15.1 mV	Pass
100% Load	27.2 mV	32.7 mV	25.3 mV	17.8 mV	Pass
Crossload 1	33.3 mV	39.4 mV	26.4 mV	12.3 mV	Pass
Crossload 2	13.3 mV	18.3 mV	17.4 mV	15.0 mV	Pass

Ripple suppression at +12V is impressive. Even at full load and with the high temperature we pumped into the hotbox the above rail did not exceed 30mV at full load. The minor rails showed decent ripple suppression which is away from the 50mV limit, however we have seen other high-end units registering much less ripple on these rails. Strangely enough at CL1 test ripple on almost all rails (except 5VSB) increased. Apparently we pushed the minor rails to their limits during this test. At CL2 test the unit delivers 100A at +12V registering at the same time only 13.3mV of ripple on the same rail. This is what we call jaw-dropping performance!

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.