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 |
Enermax’s Platimax 850W power supply offered up very tight voltage regulation and while it can’t compete with some more advanced digital units and Seasonic made units, it still has voltage regulation that is miles within the ATX specifications. Overall the Platimax 850W delivers an exceptionally low level of ripple and noise.
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