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AOpen Silent Power AO400-12AHN 400W Power Supply Review
AOpen Silent Power AO400-12AHN 400W Power Supply Review - PCSTATS
Abstract: This 400Watt unit comes armed with a bristling array of cables as well as a rear mounted knob which controls the speed of the LED-lighted 120mm fan.
Filed under: Power Supply Published:  Author: 
External Mfg. Website: AOpen Feb 03 2005   M. Dowler  
Home > Reviews > Power Supply > AOpen AO400-12AHN

Voltage Values and Figures

*All voltages were read from the Motherboard BIOS.

Listed Voltages Lower Voltage Upper Voltage Jitter
+3.3V 3.47v 3.47v 0.04v
+5.0V 4.92v 4.98v 0.06v
+12V 13.36v 13.50v 0.14v
-12V 12.00v 12.00v 0.00v
-5.0V 5.00v 5.00v 0.00v
+5.0Vsb 5.00v 5.00v 0.00v

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 noting.

Seasonic Load Tests Source: Seasonic

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 overview.

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 = PF.

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.

Seasonic Load Tests

Power Supply Wattage Test Load Unloaded
Seasonic SuperTornado 400 W Active Power 177 W 6 W
Apparent Power 182 VA 7 VA
Vantec iON2

350 W

Active Power

192 W

10 W
Apparent Power 277 VA 21 VA
Antec TruePower 330 330 W Active Power 195 W 22 W
Apparent Power 289 VA 38 VA
Ultra X-Connect Green UV 500W 500 W Active Power 193W 22 W
Apparent Power 307 VA 40 VA
AOpen Silent Power AO400-12AHN 400W Active Power 179W 9 W
Apparent Power 275 VA 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.

The Silent Power is blessed with an extremely attractive lighted 120mm cooling fan, which certainly added to the overall effect. The included fan control knob seems like an afterthought, and doesn't have any significant effect on the already minimal noise created by the fan. While it does reduce or increase airflow depending on the setting, there's no appreciable reason for not having it set on maximum at all times.

The electrical performance of the power supply was good overall. While it showed itself to be a tad inefficient with power under load, it's unloaded efficiency was excellent, and it provided very stable (if a little uneven) power to our test system.

With a retail price of approximately $112CDN ($92USD), the AOpen Silent Power AO400-12AHN looks to be a good buy if you are looking around for a standard lower-noise PSU for your PC.

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Related Articles

Here are a few other articles that you might enjoy as well...

1. Antec TruePower 330W Power Supply Review
2. PC Power & Cooling Turbo-Cool 510-PFC Power Supply
3. Seasonic Super Tornado 400W Power Supply Review
4. Vantec iON2 350W Power Supply Review
5. Ultra X-Connect Green UV 500W Power Supply

< Previous Page © 2022 PCSTATS.com Power Supply Reviews...»


Contents of Article: AOpen AO400-12AHN
 Pg 1.  AOpen Silent Power AO400-12AHN 400W Power Supply Review
 Pg 2.  Appearance and physical specifications
 Pg 3.  — Voltage Values and Figures

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