Raijintek decided to enter the tough PSU market with a pair of highly affordable SFX units. Usually, "SFX" and "affordable" aren't combined, but Raijintek and the OEM, Casecom, have managed to develop a decent solution. The Ermis 550B is worthy of its price tag, offering a high performance per dollar ratio. Thus far, I haven't evaluated any other SFX PSUs of similar capacity below Gold-certified efficiency, so I had to use more expensive, higher-grade SFX units in my charts, which made for less than ideal comparisons to the small Ermis unit. If you don't want to spend much but still need an SFX PSU, you have an option now thanks to Raijintek. On the other hand, if money is not a problem, the best SFX PSUs money can buy today belong to the Corsair SF series.

The cons list of the Ermis 550B looks like a laundry list, but this is because I am extra picky, and I also have to report everything that doesn't line up with the ATX specification and my standards. Usually, brands avoid sending me highly affordable products for testing because they don't want to spoil their image. Raijintek, on the other hand, is sure about its product and didn't have a problem in asking me to review these units—it is a good sign when a brand isn't afraid of reviews. The first seven entries of the cons list are the most important for users who need an affordable SFX PSU. Given how affordably priced it is, you can safely ignore the rest. Without spending any money, Casecom can fix the OCP triggering points at +12 V and the minor rails, which are set way too high. Moreover, an MOV costs about a dollar, depending on quantity, which I would happily pay to have source protection. However, a better fan and higher-quality caps would seriously affect pricing. You cannot have it all in an SFX PSU with a $65 price tag. Lastly, there isn't anything you can do to fix the mediocre transient response aside from using a modern platform, which would considerably increase production costs.

Suppose you are covered by 100 W less and don't mind spending $15 more. In that case, you could get the Corsair SF450 Gold instead, which has a fully modular cable design, higher build quality, is supported by a longer warranty, and offers notably higher performance.