Hot Test Results

The tables below show that the Antec EDGE 550W has very good, albeit strange, electrical performance. It has excellent voltage regulation, maintaining all voltage lines between 1.7-2% across the load range. The filtering is where things get a bit peculiar.

The EDGE 550W has exceptional filtering on the 12V line, with our instrumentation displaying a maximum voltage ripple of just 38mV; however, the filtering of the 5V line is mediocre, reaching 38mV as well, which is nearly 80% of the 5V line design limit. The filtering of the 3.3V is excellent as well, with the ripple peaking at just 20mV under maximum load. As the 5V line is being derived by a DC-to-DC conversion circuit similar to that of the 3.3V line, we investigated this result extensively and even searched the parts for a malfunctioning component, but nothing was found to be problematic. It appears that the filtering of the 5V line (at least on the sample we received) is rather weak.

Main Output
Load (Watts) 111.69 W 278.11 W 412.77 W 548.36 W
Load (Percent) 20.31% 50.57% 75.05% 99.7%
Line Amperes Volts Amperes Volts Amperes Volts Amperes Volts
3.3 V 3.12 3.37 7.79 3.36 11.69 3.32 15.58 3.31
5 V 3.12 5.04 7.79 5 11.69 4.98 15.58 4.95
12 V 7.01 12.19 17.53 12.15 26.29 12.01 35.06 11.97

Line Regulation
(20% to 100% load)
Voltage Ripple (mV)
20% Load 50% Load 75% Load 100% Load CL1
3.3V + 5V
3.3V 1.7% 10 14 16 20 8 16
5V 2% 12 20 28 38 12 42
12V 1.8% 16 24 30 38 40 18

Aided by its low thermal losses and internal temperatures, it appears that a high ambient temperature hardly affects the performance of the Antec EDGE 550W unit. The reduction of the average nominal load (20-100%) efficiency is minimal, just 0.4%, while the maximum efficiency is 92.1% at 50% load. With these performance figures, the Antec EDGE 550W could receive its 80Plus Gold certification even under this much higher ambient temperature.

The high ambient temperature naturally affects the behavior of the cooling system and the acoustic performance of the unit. However, due to the low output of the unit, the temperature of the heatsinks still remains relatively low. As such, the Antec EDGE 550W does not really need to make its fan spin faster in order to maintain safe operating temperatures. The only difference is that the fan increases its speed further while the unit is under maximum load, but the higher SPL hardly makes a change that would be easily noticeable by a person's ear.

Cold Test Results Conclusion
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  • Daniel Egger - Saturday, October 4, 2014 - link

    > For non gaming rigs, it's more like 40-70w just browsing the web & using office, 100w max full video encoding, etc, and that could easily run off a Pico-PSU laptop style power brick.

    In fact HP and and a few other companies are selling not only all-in-ones but also mini-tower PCs which are powered by external 19V power bricks. I ordered one of those a couple of months back for a family member. Sure there's no discrete GPU in that but it still offers quite a bit of bang and is perfectly capable of handling any typical office activities and even light gaming. I couldn't make it draw more than 70W at the wall.
  • KAlmquist - Sunday, October 5, 2014 - link

    Referring to 28 watts out of the power supply, and 37 watts measured at the wall, the reviewer writes that "most systems will be closer to twice that power draw at idle." So I'd like to underline the fact that you are measuring 37 watts at the wall idle even with a GPU.
  • Morawka - Saturday, October 4, 2014 - link

    whats wrong with all the images on this site? they are all broken. Same with daily tech. (reset your cache, you'll see.

    missing on both my iphone and desktop.
  • TelstarTOS - Saturday, October 4, 2014 - link

    I've seen this 5V regulation issue on another PSU, I believe Seasonic's own latest G-series. I dont like it but it's within specs anyway.
  • bhima - Wednesday, October 8, 2014 - link

    Hrmm... $120 is a steep price to pay for silence on a component that is typically the least offender as far as noise in concerned (ie: Case, CPU fan and GPU are the big noise makers).

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