SilverStone Strider Platinum ST55F-PT 550W PSU Review

SilverStone comes to us today with a Platinum rated PSU that is also billed as having a "Power Density (of) 305W per liter." While this is a bit odd, the messaging seems to be big power in a little footprint. Let's see how this "ultra silent" fully modular PSU stacks up when it comes to serving up big-time power under big-time pressure.


SilverStoneTek is a company best known for its high quality cases but its product lines extend into other components such as cooling, power, fans, storage, and so on. As a company, Silverstone has built up this impressive product repertoire in a very short time having been founded in 2003. Today, however we are interested in its power supplies which are comprised of the Strider, SFX, Nightjar, Gemini, and Zeus model lines that range from 300W to 1500W DC output. For this review, we are looking at SilverStone’s recent revision to the Strider line, the ST55F-PT , which is produced in conjunction with Sirfa/High Power.

Sirfa Electronics Co., Ltd. is a name that is not that familiar to most users but Sirfa has been around since 1996 when Sirtec established Sirfa as a factory in the Sirtec group on mainland China. In June 2008, Sirtec sold off its interest in Sirfa making the company independent of the Sirtec brand but still in business with High Power. As such, while we have not seen any Sirfa produced power supplies under the Sirfa brand, some of the Sirtec units of the past were produced at the Sirfa facility. Additionally, we have seen Sirfa providing OEM services for Thermaltake, Enermax, PC Power & Cooling, Tuniq, Lepa, SilverStone, and others with very mixed results.

Article Image

Just a Small Bit of Platinum

Over the years, we have reviewed a number of power supplies from SilverStone. Of late, we have seen a common theme from SilverStone that revolves around a reduction in footprint of their ATX12v specification power supplies enabling their usage in ever-smaller builds. While this change is certainly welcome for a certain niche of users, it is important that performance not be sacrificed to a great extent in this process. So, today, when we look at the ST55F-PT we are not only going to be looking at its smaller than average stature, but also all of the other things a power supply is supposed to do.

Before moving on, let's see what SilverStone has to say about this particular power supply:

As desktop computers continue to advance toward ever more efficient and smaller designs, SilverStone is helping to drive the efficiency movement by releasing the Strider Platinum series of power supplies. Created to be the smallest fully modular ATX power supplies with 80 PLUS Platinum efficiency, they are also incredibly quiet with the ability to run in fanless mode. If the loading condition is below 20%, the fan in the power supply can remain off for silent operation during idle or low powered computing activities. Other great features inherited from previous Strider series include ط·آ£ط¢آ¯ط·آ·ط¹ط›ط·آ¢ط¢آ½3% regulation, powerful single +12V rail, 24/7 continuous power output, and multiple PCI-E cables. For those looking to build highly efficient systems in small footprints, the Strider Platinum is definitely the best choice.

With that preview of what SilverStone expects from the ST55F-PT out of the way, let’s move on and see what we can expect when a user purchases the ST55F-PT power supply at retail in terms of documentation, accessories, cable count, rail layout, output characteristics, and general build quality.