*All voltages were read from the Motherboard BIOS.
| Listed Voltages
|| Lower Voltage
|| Upper Voltage
The good new is that
the AOpen Silent Power
AO400-12AHN showed barely any fluctuation in voltage during testing.
The bad news is that the +12V rail was a little on the high side,
though not nearly enough to cause problems. If anything, this might be a
positive attribute for stability, but it's worth
When looking at the Seasonic Power Supply test results we see two values, wattage
and volt-amps. Since it might not be clear what they measure, here's a brief
The volt-amp (VA) value is how much real
power is being consumed by the power supply being tested to provide the wattage
(W) value. The higher the VA value is, the more electricity is
being used by the power supply. Because no electrical device is 100%
efficient, there will always be some loss when converting AC to DC. The
closer the volt-amps and wattage figures are to each other, the more efficient a
power supply is. This is called the Power Factor: wattage / volt-amps =
Since we're testing with a 120W dummy load, the
load on the power supply (wattage) should be as close to this figure as
possible. Anything above this load in apparent power describes the overhead and
wasted energy (given off as heat) for the particular power supply being tested.
For the unloaded tests, the wattage and volt-amp
figures should be as close as possible to one another. The lower the figures
are, the less power is being used.
||7 VA |
||21 VA |
|Antec TruePower 330
||38 VA |
|Ultra X-Connect Green UV 500W
||40 VA |
|AOpen Silent Power
||18 VA |
The AOpen Silent Power AO400-12AHN shows decent numbers here, though we'd like to have seen
less of a discrepancy between the load W and VA numbers. This PSU is
economical on power when its not loaded though, which is a good sign of
quality. All in all, this power supply showed average performance in this
power efficiency test.
A good all around power supply
We were generally
pleased by the AOpen Silent Power AO400-12AHN power supply. AOpen has a good
reputation for producing quality products, and this looks like another one.