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The Gigabyte P550B is offered at a low price, and this is its main advantage. Apart from the low EMI emissions, the compact dimensions, and the correctly set OPP, there are no other major positives for this product. It seems like Gigabyte just took an outdated platform from MEIC and put its badge on it without taking the time to test it and tune it properly.
However, we are not even sure if several of this product's significant flaws can be fixed, given the platform's old design. Besides low overall performance and bottom low efficiency, especially with light loads, the fan speed profile is highly aggressive since it has to cool the low-quality caps. The bridge rectifier doesn't use a proper heat sink, and the quality of the FETs that MEIC used is questionable. We were surprised that this unit could survive our tests, but if we pushed it a little more, it would easily break, given that there is no over-temperature protection.
