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Seasonic G-Series 450W PSU Review

Seasonic's G series consists of reliable, high-performance PSUs. Today, we're reviewing the G-450 with 450W capacity, which features a semi-modular cabling design.

Ripple Measurements

To learn how we measure ripple, please click here.

The following table includes the ripple levels we measured on the G-450's rails. The limits, according to the ATX specification, are 120mV (+12V) and 50mV (5V, 3.3V and 5VSB).

Test12V5V3.3V5VSBPass/Fail
18.1mV6.8mV9.7mV8.5mVPass
28.8mV8.0mV9.8mV10.1mVPass
310.8mV7.3mV10.5mV11.4mVPass
412.0mV8.0mV11.0mV12.2mVPass
513.0mV8.6mV10.8mV14.0mVPass
615.1mV9.9mV11.1mV13.9mVPass
717.0mV11.5mV11.7mV15.2mVPass
819.2mV19.9mV12.6mV15.7mVPass
921.4mV20.1mV13.1mV16.3mVPass
1024.7mV21.9mV13.2mV18.0mVPass
1126.4mV23.7mV13.4mV18.4mVPass
CL111.1mV9.7mV8.7mV12.9mVPass
CL223.4mV18.4mV9.2mV16.4mVPass
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Ripple suppression is excellent on all rails; Seasonic did a fine job here. Some users may say that Super Flower's implementations are better in this area. However, we are satisfied with the G-450's ripple suppression.

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.