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Antec VPF Series 650W PSU Review

Antec's VPF650 is a budget PSU made by Delta Electronics to achieve high-performance-per-dollar. In the US, the VPF units are sold under the EarthWatts Green series.

Ripple Measurements

To learn how we measure ripple, please click here.

The following table includes the ripple levels we measured on the rails of the VPF650 unit. The limits, according to the ATX specification, are 120mV (+12V) and 50mV (5V, 3.3V and 5VSB).

Test12V5V3.3V5VSBPass/Fail
10% Load11.4mV13.2mV14.7mV9.6mVPass
20% Load16.8mV14.2mV16.6mV10. mVPass
30% Load18.6mV14.9mV17.0mV11.0mVPass
40% Load21.3mV15.6mV17.2mV11.7mVPass
50% Load23.4mV15.9mV19.2mV12.7mVPass
60% Load26.4mV16.2mV21.7mV15.4mVPass
70% Load27.5mV17.6mV22.2mV16.2mVPass
80% Load29.2mV18.9mV26.2mV16.5mVPass
90% Load29.6mV19.8mV27.1mV17.3mVPass
100% Load30.5mV22.5mV29.7mV17.8mVPass
110% Load33.0mV24.6mV31.4mV20.7mVPass
Cross-Load 120.8mV16.6mV18.4mV9.8mVPass
Cross-Load 232.7mV23.3mV28.9mV16.3mVPass
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Delta's designs suppress ripple efficiently and the VPF650 clearly isn't an exception to this. Although we have seen Delta PSUs with one-digit ripple readings on most rails, we should point out that these were high-end platforms costing way more. For the budget category, the ripple suppression that the VPF650 achieves is about as good as you'll get.

Ripple Oscilloscope Screenshots

The following oscilloscope screenshots illustrate the AC ripple and noise registered on the main rails (+12V, 5V, 3.3V and 5VSB). The bigger the fluctuations on the screen, the bigger the ripple/noise. We set 0.01V/Div (each vertical division/box equals 0.01V) as the standard for all measurements.

Ripple At Full Load

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Ripple At 110-Percent Load

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Ripple At Cross-Load 1

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Ripple At Cross-Load 2

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Aris Mpitziopoulos
Aris Mpitziopoulos is a Contributing Editor at Tom's Hardware US, covering PSUs.