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Performance Rating
(Image credit: Tom's Hardware)
The P550B gets last place in this chart. This doesn’t sound weird, given its bad ripple suppression at 12V and the equally bad transient response performance.
Noise Rating
The graph below depicts the cooling fan's average noise over the PSU's operating range, with an ambient temperature between 30 to 32 degrees Celsius (86 to 89.6 degrees Fahrenheit).
(Image credit: Tom's Hardware)
Low efficiency means increased thermal loads, so the fan has to work hard to protect and cool down the PSU. This translates to high noise output. The P550B is noisy, so if you want to build a quiet system, remove it from your list.
The following graph shows the PSU's average efficiency throughout its operating range with an ambient temperature close to 30 degrees Celsius.
(Image credit: Tom's Hardware)
This is a low-efficiency platform. If you need higher efficiency and lower thermal loads, better get something else.
Power Factor Rating
The following graph shows the PSU's average power factor reading throughout its operating range with an ambient temperature close to 30 degrees Celsius.
