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FSP Hydro X 450 Power Supply Review

After the Hydro G series, FSP decided to release a more affordable power supply called the Hydro X, which targets systems with lower energy needs. This PSU line consists of three units, and in this review we're testing the entry-level 450W model.

Ripple Measurements

To learn how we measure ripple, please click here.

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

Test12V5V3.3V5VSBPass/Fail
10% Load36.7mV9.2mV7.8mV13.2mVPass
20% Load31.3mV8.9mV7.9mV16.1mVPass
30% Load26.9mV11.5mV8.9mV18.5mVPass
40% Load30.6mV11.1mV9.0mV19.3mVPass
50% Load33.1mV11.4mV8.7mV20.5mVPass
60% Load34.5mV12.8mV9.3mV23.5mVPass
70% Load32.6mV14.8mV9.3mV23.6mVPass
80% Load36.0mV15.9mV10.0mV26.9mVPass
90% Load38.6mV15.5mV11.1mV28.9mVPass
100% Load44.0mV17.8mV11.9mV29.1mVPass
110% Load47.0mV18.4mV12.1mV30.6mVPass
Cross-Load 135.4mV13.0mV10.1mV12.1mVPass
Cross-Load 238.5mV15.5mV10.7mV20.2mVPass
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Ripple suppression is satisfactory on the +12V rail and good on the minor rails (5V and 3.3V). At 5VSB, ripple is a little higher compared to the other rails. But it's still much lower than the corresponding limit. Moreover, this rail just isn't that important. As long as its ripple doesn't exceed 50mV, you have nothing to worry about.

In general, the HGX450 demonstrates good ripple performance. And thanks to its Japanese electrolytic caps, this performance should remain at the same levels on the long run. PSUs with lower-quality caps, even if they offer high performance initially, age more quickly, causing performance to take a hit over time.

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.