Skip to main content

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.

Load Regulation, Hold-Up Time And Inrush Current

To learn more about our PSU tests and methodology, please check out How We Test Power Supply Units. 

Primary Rails And 5VSB Load Regulation

Load Regulation testing is detailed here.

Image 1 of 8

Image 2 of 8

Image 3 of 8

Image 4 of 8

Image 5 of 8

Image 6 of 8

Image 7 of 8

Image 8 of 8

Hold-Up Time

Our hold-up time tests are described in detail here.

Image 1 of 6

Image 2 of 6

Image 3 of 6

Image 4 of 6

Image 5 of 6

Image 6 of 6

As we expected, the low-capacity bulk cap doesn't allow for better results in these tests, so the PSU fails all three of them.

Inrush Current

For details on our inrush current testing, please click here.

Image 1 of 2

Image 2 of 2

Inrush current is a little higher than what we expected from such a low-capacity PSU. However it won't cause any problems.

Load Regulation And Efficiency Measurements

The first set of tests explores voltage rail stability and efficiency. The applied load equals (approximately) 10 to 110 percent of the supply's maximum in increments of 10 percentage points.

We conducted two additional tests. During the first, we stressed the two minor rails (5V and 3.3V) with a high load, while the load at +12V was only 0.10A. This test reveals whether a PSU is Haswell-ready or not. In the second test, we determined the maximum load the +12V rail could handle with minimal load on the minor rails.

Test #12V5V3.3V5VSBDC/AC (Watts)EfficiencyFan Speed (RPM)Noise (dB[A])Temps (In/Out)PF/AC Volts
11.924A1.983A1.951A0.985A44.7582.47%69526.237.22 °C0.958
12.044V5.041V3.378V5.067V54.2640.43 °C115.1V
24.897A2.980A2.933A1.184A89.7387.50%69526.238.20 °C0.986
12.026V5.024V3.372V5.048V102.5541.75 °C115.1V
38.227A3.498A3.445A1.385A134.8789.01%69526.238.62 °C0.987
12.007V5.010V3.363V5.037V151.5342.97 °C115.1V
411.557A4.004A3.930A1.589A179.7389.75%69526.239.95 °C0.988
11.990V4.995V3.356V5.018V200.2544.73 °C115.1V
514.558A5.020A4.923A1.800A224.7389.96%73523.540.93 °C0.989
11.970V4.975V3.351V4.997V249.8146.53 °C115.1V
617.567A6.052A5.914A2.007A269.6989.79%86528.541.71 °C0.989
11.949V4.957V3.347V4.977V300.3548.17 °C115.1V
720.586A7.088A6.911A2.215A314.6389.43%96031.142.54 °C0.988
11.929V4.936V3.341V4.957V351.8350.13 °C115.1V
823.634A8.147A7.914A2.428A359.7088.92%106032.443.24 °C0.988
11.903V4.912V3.335V4.933V404.5151.86 °C115.1V
927.100A8.677A8.443A2.437A404.7088.41%116535.044.50 °C0.987
11.886V4.899V3.327V4.920V457.7854.71 °C115.1V
1030.533A9.208A8.963A2.545A449.5287.83%124037.445.33 °C0.985
11.867V4.888V3.313V4.905V511.8157.47 °C115.1V
1134.371A9.224A9.013A2.549A494.4587.13%133539.546.38 °C0.983
11.849V4.880V3.295V4.895V567.5160.39 °C115.1V
CL10.099A14.021A14.004A0.000A117.7783.83%110032.644.19 °C0.987
12.000V4.928V3.391V5.041V140.4954.48 °C115.1V
CL237.476A1.003A1.003A1.001A458.4888.62%121036.545.42 °C0.985
11.880V4.956V3.291V4.988V517.3757.78 °C115.1V

Load regulation at +12V and 3.3V is satisfactory, while on the 5V and 5VSB rails it's average. When it comes to noise output, the HGX performs well since the fan spins slowly in most tests. Even in the worst-case overload test, noise doesn't exceed 40 dB(A). FSP arms this unit with a relaxed fan profile, so under normal conditions you won't hear the fan unless you're right on top of it.

Despite taxing conditions inside of our hot-box, the PSU satisfies the 80 PLUS Gold requirements in all three tests (20%, 50% and full load); it truly deserves its Gold rating.

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