Antec Signature 650W Power Supply

DC Output Stability and Quality

The 3.3V and 5V rails both have ~2.5% regulation, and are close to the ideal voltages. The 5V standby rail is a little weaker and goes down around 3% from its starting point of 5.01V. Since this PSU has three 12V rails, we combined these as usual into one graph, so the graph thickens if the rails have different results. Since the three rails aren't very different, the graph stays rather thin. The largest difference comes with 110% load with 12V1/11.88V, 12V2/11.86V and 12V3/11.82V. All in all, the Signature 650W turns in a very decent regulation, again with only 2.5% fluctuation.

The ripple on the lower voltage rails of 3.3V and 5V seems to be a bit high, even though they are within specifications. The 5V rail reaches up to 14.50mV. The 12V rails (represented here by 12V1 as an average of the three rails) have slightly lower results of up to 8.639mV.