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SilverStone SX550 SFX PSU Review

SilverStone continues to enrich its SFX PSU portfolio. One of the most recent additions is the SX550, a budget-oriented unit featuring Gold-class efficiency and fixed cables instead of modular ones. As you can tell, it's intended to bring prices down.

Cross-Load Tests And Infrared Images

Our cross-load tests are described in detail here.

To generate the following charts, we set our loaders to auto mode through our custom-made software before trying more than 25,000 possible load combinations with the +12V, 5V and 3.3V rails. The load regulation deviations in each of the charts below were calculated by taking the nominal values of the rails (12 V, 5 V and 3.3 V) as point zero.

Load Regulation Charts

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Efficiency Chart

Compared to other Gold-rated PSUs, the results of this platform look poor. Surely efficiency isn't among the ACRF topology's strengths. However, we are pretty sure that FSP could improve the design in order to offer better overall performance.

Ripple Charts

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Infrared Images

Toward the end of the cross-load tests, we took some photos of the PSU with our modified FLIR E4 camera that delivers 320x240 IR resolution (76,800 pixels).

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The temperatures inside SilverStone's SX550 are normal, despite of the decreased efficiency under full load. Obviously the small fan does a pretty good job by effectively exhausting hot air generated by the ACRF-based platform.

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