Performance Rating

Overall performance is below other SFX PSUs, which do cost more. With better ripple suppression and tighter transient response, the Ermis unit would score much higher, but both take a modern platform, especially the latter, which would increase cost.

Noise Rating

The graph below depicts the cooling fan's average noise output throughout the entire operating range of the PSU, with an ambient temperature between 30°C and 32°C.


The Ermis unit manages to beat more efficient platforms in average noise output.

Efficiency Rating

The graph below shows the PSU's average efficiency throughout its operating range, with an ambient temperature between 30°C and 32°C.


Most SFX units available today have high efficiency certifications, so the Ermis 550B doesn't manage to stand out in this graph.

5VSB Efficiency Rating

The graph below shows the PSU's average efficiency at 5VSB, with an ambient temperature between 30°C and 32°C.


The 5VSB rail is inefficient.

PF Rating

The graph below shows the PSU's average PF throughout its operating range, with an ambient temperature between 30°C and 32°C.


At 230 V input, the APFC converter performs better than other SFX units, which is a pleasant surprise.