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Power Consumption With Different PSUs

Efficiency: Core 2 Nukes Atom On The Desktop
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Having introduced four entirely different power supply units, it’s now time to look at the power consumption results each of them produced. We used the Foxconn G31MG-S and the Core 2 Duo E7200 for this test. Clearly, the OCZ and Cooler Master power supplies don’t do our low-power systems any service, as they lead to an increase in system power when idle by almost 45%:

While the small FSP220 power supply from Fortron reduces the system idle power of the G31 platform to only 29 W (we achieved this by using only one 2 GB DIM module!), any of the other units would have this value increase to 38 W (with the Etasis) and over 40 W (with the Cooler Master or OCZ).

The results are similar when the processor is running at peak power using the FSP220–system peak power is limited to 64 W. The 300 W power supply unit from Etasis increased the result to 72 W; Cooler Master had this number increase to 78 W; and the most powerful OCZ power supply drove peak power all the way up to 78 W, which is almost 22% higher than the ideal result taken with the Fortron 220 W power supply unit.

The difference is smaller at peak power, as the more powerful power supply units operate at more efficient power levels, which helps to close the gap.

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