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 | 5 | 5 | 10 |
| 40 | 5 | 5 | 20 |
| 60 | 10 | 10 | 30 |
| 80 | 10 | 10 | 35 |
| 100 | 10 | 15 | 40 |
It’s probably only got a single PCI-E 6+2 because it’s not a true 450W PSU!
Not sure what you mean by that, it is a true 450W, it is capable of supplying 450W continuously.
It’s a true 450 W PSU
They may have put those cables for cost savings or even thinking about most exaggerated builds (for example FX9xxx), where the CPU itself can draw 200 W or more, the 8 pin PCIe connector would mean a 225 W GPU (75W+150W). That leaves you 25 W for storage and mb…
It’s a true 450 W PSU
They may have put those cables for cost savings or even thinking about most exaggerated builds (for example FX9xxx), where the CPU itself can draw 200 W or more, the 8 pin PCIe connector would mean a 225 W GPU (75W+150W). That leaves you 25 W for storage and mb…