SilverStone SFX SX500-G 500W Power Supply Review

SilverStone has been championing as well as leading the SFX form factor push for computer power supplies. Its SX500-G represents what we think is he most power we have ever seen shoehorned into a minuscule footprint. SilverStone likes to refer to the it in Watts Per Liter. At 630 "WPL" shows it takes up less than a liter of space in your new build.


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 one of SilverStone’s new SFX units, the SX500-G, which is produced in conjunction with Sirfa.

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.

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500W of SFX Goodness?

When it comes to SFX/SFX-L power supplies, over the years, we have not seen a lot of them in our reviews relative to the number of standard ATX/EPS power supplies we have reviewed. However, there is a decent chance that when we have a SFX/SFX-L unit up for review it is from SilverStone as they have been the most prolific producer of SFX/SFX-L units in our reviews. In fact, today's SX500-G is the seventh SFX/SFX-L unit we have seen from SilverStone (though it is the first 500W unit). So, we have a fairly good body of previous work to compare this unit to when it comes to SFX/SFX-L units in general (even if there are no other 500W units specifically). That said, SilverStone has done quite well in this segment from a quality stand point and from an innovation standpoint. So, today, we would expect nothing less than the same once more; a good quality SFX offering. Before assuming too much about this unit though, let's see what SilverStone has to say about this specialty item:

After pioneering full featured, high performance SFX power supplies in 2012, SilverStone has continued refining the segment it has created. The SX500-G and SX650-G are yet another evolutionary step toward perfecting this small form factor power supply category. They are more powerful without growing in size to achieve class-leading power density levels of 633W per liter for the SX500-G and 818W per liter for the SX650-G. This increase in power density was achieved through more advanced engineering and component selection so rather than added noise as is the norm for upping wattage output in power supplies, the SX500-G and SX650-G are quieter than their less powerful predecessors. Their noise signature was further lowered thanks to the use of 92mm fans versus 80mm on previous models. For connectivity, the SX500-G and SX650-G are equipped with more connectors so they can be used in wider variety of system configurations. SilverStone’s famed short, flexible flat cables will of course be part of the package as well (a longer standard length cable set, the PP05-L is available for purchase separately). For those looking for the best bang for the buck in high performance SFX power supplies, the SX500-G and SX650-G will not disappoint.

Let’s move on and see what we can expect when a user purchases the SX500-G power supply at retail in terms of documentation, accessories, cable count, rail layout, output characteristics, and general build quality.