FSP DAGGER PRO 550W SFX Power Supply Review

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The FSP DAGGER PRO 550W packaging is diminutive which is fitting given the unit’s diminutive size. On the front of the package are a couple of rows of advertising that include things such as “DC to DC”, “100% Japan-made E-cap”, “Semi-Fanless”, etc. We also find that FSP is advertising this unit as adhering to the 80 Plus Gold standard of efficiency but a check of the 80 Plus website did not list this unit as certified for 80 Plus Gold at the time of testing. Moving to the rear of the packaging of the DAGGER PRO 550W, we find even more advertising about different aspects of the power supply. Moving to the sides of the box, we find the power label (reproduced below), connector count (reproduced below), and an efficiency graph. Lastly, the DAGGER PRO 550W carries a 5-year warranty.

FSP DAGGER PRO 550W SFX Power Supply Connector Type
FSP DAGGER PRO 550W SFX Power Supply Wattage and Voltage

The DAGGER PRO 550W is advertised as being a single 12v rail power supply with a capacity up to 45A (or ~98% of the unit’s capacity) if necessary. The minor rails (5v and 3.3v) have a capacity of 20A each and the combined capacity of those two rails is 120W. Combined with these outputs, we find that this unit has 2 PCIe connectors, 5 SATA connectors, and 2 Molex connectors.

Once we open the FSP DAGGER PRO 550W packaging, we are left looking at the unit, power cord, mounting screws, ATX adapter plate, and user manual. The user manual includes a pinout guide, a power label, and some very short installation instructions. That is all, and not terribly complete. Let’s move on to see what this unit looks like when we open it up!

Paul Johnson
Paul is a long time PC hobbyist and tech enthusiast having gotten his start when he broke his first C64 quickly followed by breaking his first IBM XT. Most notably however, for 12 years, he served as the Power Supply Editor for one of the truly early, groundbreaking, and INDPENDENT PC enthusiast sites ([H]ardOCP) until its mothballing in April of 2019. Paul now brings the same flair and style of his power supply reviews to The FPS Review.

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