Ripple
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. millivolt ripple is measured by the peak to peak size of the voltage curve.
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. Millivolt figures are stated to the closest increment of 5 given their variability.
| Load (%) | 3.3V Ripple | 5V Ripple | 12V Ripple |
| 20 | 12 | 10.4 | 12.8 |
| 40 | 15.2 | 13.2 | 15 |
| 60 | 16.8 | 16.4 | 26.6 |
| 80 | 18.4 | 18.6 | 32.4 |
| 100 | 20.4 | 23.4 | 44.8 |
Ripple suppression was good across all rails; less than 25mV on the 3.3 and 5 volt rails and less than 50mV on the 12 volt rail is a strong result for this price point. Better performance can be had on other units, such as Seasonic or Super Flower ones, but generally speaking these units will be more expensive or have lower efficiency to meet the same price point.
3.3 volt @ 100%
5 volt @ 100%
12 volt @ 100%
There’s no reason to state “Fan speed lower is better” on the chart because that is only a subjective opinion while factually speaking, higher is better for the PSU itself to reduce temperature except in this particular case that low quality Yate Loon fan will probably wear out its sleeve bearing before the life of the PSU is otherwise exhausted.
Hello. I am looking into buying a new PSU for my computer. I will upgrade to the AMD R7-370, my CPU is AMD FX4300. I want to buy the Thermaltake Tt Toughpower DPS G 550W ATX23 (here is the link http://hardware.nl/thermaltake/ps-tpg-0550dpcgeu-g.html ), but it seems to be different from the one you are reviewing. Is this a really different line? The one to which I linked has a 140mm ventilator, so it should be quieter. But the one I see in the image has a 120mm.
Yeah, it seems so. Strange Google gives this link when I am looking for a different Thermaltake.