There isn't really any other way to say this other than to just come out with it. The power supply industry isn't exactly super exciting. You don't hear people talking about the latest 1000W power supply that just came out and you certainly don't see tables where the new units are benched under 15 trillion different applications just to see what it is capable of. Unless you're deep into the very specifics of electronic circuitry, this will always hold constant for the most part.
There are a few little gems that come along though that are exciting to take a look at and this new unit on the bench from SilverStone is one of them. The power supply I'm speaking of is the ST45SF-G. It is a 450W power supply with a single 12V rail, rated for 80 PLUS Gold efficiency and is fully modular. Now that doesn't sound particularly special compared to everything else that we take a look at here, but there is a little bit more to it that just those specifications.
The SilverStone ST45F-S is also a Small Form Factor (SFX) power supply. For those who aren't familiar SFX power supplies and want to do some technical reading on them, I highly suggest that you take a look at the SFX12V Power Supply Design Guide. In it you'll find that SFX power supplies are essentially identical to that of ATX12V power supplies, but they are smaller in size. The big difference is that there are about five different fan configurations that can be used so that the fan can be placed as needed. This does change the dimensions of the unit too, but makes it a lot more flexible for specialized uses such as in a NAS or various SFX cases. The ST45SF-G that we have today has the fan on the bottom of the unit just like your typical ATX12V power supply.
You'll find that the ST45SF-G is a bit beefier than other SFX units out there as most are meant to power systems needing 250W or less. SilverStone wants you to be able to do more than turn on a calculator, so they've upped the ante a bit. Let's start digging in to this little beast and see what it is made of.
Specifications, Availability and Pricing
SilverStone's ST45SF-G features a single 12V rail rated for 37A or 444W of power. The 3.3V rail is rated for 19A, while the 5V rail is rated for 15A. The minor rails are rated for a maximum combined output of 90W. The 5VSB is rated for 2.5A or 12.5W. Maximum combined output for the ST45SF-G is 450W.
Something that you wouldn't normally expect from a low wattage unit or something that is meant for specialty machines is a full list of features. The ST45SF-G fills our feature summary more than we would expect, but it does come up just a bit short for nothing but green check marks. It has SCP, OVP, OCP, OPP and even OTP. Perhaps the most shocking in this list is that not only are all of the cables fully sleeved, but they are also fully modular. The SilverStone ST45SF-G is rated for 80 PLUS Gold efficiency, but is not rated for 100% continuous output at 50C. Instead SilverStone rates the unit at a more modest 40C, just as they do with almost all of their units.
Silverstone's ST45SF-G has an MSRP of $93.99. The cheapest we can find it for at the time of writing is $100.89 after shipping at Newegg. Without a doubt, that makes this one of the most expensive units in its class, but there aren't too many SFX units out there - especially around 450W. SilverStone backs the ST45SF-G with a three year warranty.
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