Noise and Ripple can easily be measured by an oscilloscope. These show how much voltage fluctuation there is on a particular rail. We tested the rail stability of the 3.3 volt, 5 volt and 12 volt rails using an identical time and millivolt scale for all graphs.
The latest ATX 12 volt version 2.3 specifications state that ripple from peak to peak must be no higher than 50 millivolts for the 3.3 volt and 5 volt rails, while the 12 volt rail is allowed up to 120 millivolts peak to peak to stay within specifications.
| Load (%) | 3.3V Ripple | 5V Ripple | 12V Ripple |
| 20 | |||
| 40 | |||
| 60 | |||
| 80 | |||
| 100 |
The Lepa G1000W never exceeded peak to peak ripple of 17mv on the 3.3v rail, 7mv on the 5v rail and 23mv on the 12v rail. Given the ATX specification is 50mv (3.3v and 5v) and 120 mv (12v) we can see the Lepa G1000 passed with flying colours. While the regulation on the 3.3mv is a little bit slacker than some Seasonic and Platimax units it is still exceptionally good.
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