EVGA SuperNOVA G2 1000 W Review

Name: EVGA SuperNOVA G2 1000 W
Brand: EVGA

crmaris

on Jul 11th, 2013,

in Power Supplies.

Manufacturer: EVGA

Performance Rating & Performance per Dollar »

Ripple Measurements

You will see the ripple levels we measured on the main rails of the G2-1000 in the following table. The limits are, according to the ATX specification, 120 mV (+12V) and 50 mV (5V, 3.3V, and 5VSB).

Ripple Measurements EVGA G2-1000-XR
Test	12 V	5 V	3.3 V	5VSB	Pass/Fail
20% Load	11.2 mV	44.4 mV	26.5 mV	4.1 mV	Pass
40% Load	11.8 mV	37.8 mV	20.2 mV	5.3 mV	Pass
50% Load	11.9 mV	8.3 mV	10.1 mV	5.9 mV	Pass
60% Load	13.1 mV	10.4 mV	10.4 mV	8.1 mV	Pass
80% Load	14.0 mV	10.6 mV	11.2 mV	7.6 mV	Pass
100% Load	14.2 mV	11.7 mV	11.5 mV	8.9 mV	Pass
110% Load	14.9 mV	13.9 mV	12.1 mV	9.2 mV	Pass
Crossload 1	12.0 mV	9.1 mV	9.8 mV	20.8 mV	Pass
Crossload 2	14.1 mV	8.5 mV	10.5 mV	6.5 mV	Pass

These tests revealed a very strange anomaly on the 5V rail. Only with high ambient (> 40°C) and with 20% and 40% load was ripple on this rail very high. So we had to take some scope screenshots, which you will find below, to figure out what is going on. We discovered that the increased ripple wasn't due to random noise or spikes. It actually looks like the PWM controller is responsible. The same test and its conditions affected the 3.3V rail as well, but to a smaller degree. Super Flower should look into this and fix it, although it isn't an easy scenario to reproduce, and ripple at 5V thankfully doesn't exceed the limits. The good thing is that ripple suppression is excellent on all rails under normal conditions. Also, the +12V rail isn't affected at all. Ripple suppression on this rail is outstanding and currently one of the best we have ever seen, regardless of the unit's operating temperature.

Ripple at 20% 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 0.01 V) as standard.