SilverStone SX800-LTI SFX-L Power Supply Review

SilverStone continues on its march to absolutely own the small form factor PSU market. This PSU is a huge 800 watts worth of power shoehorned into a SFX-L sized package all while claiming "silent" operation with fanless modes as well. Along with that is a healthy amount of PCIe power plugs and claims of unsurpassed efficiency.



The first thing we are going to look at with the SilverStone SX800-LTI is its packaging, accessories, and documentation. While normally none of these items is a make or break item for a power supply the packaging quite often contains a lot of information about the product we are purchasing. The inclusion of an owner’s manual that provides actual information about our product is also of great help. Accessories are almost unnecessary with a power supply as the unit is self contained, unless it is modular, but there are cases where a manufacturer can include useful accessories to make installation, routing, and use more efficient.

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Do you like the color blue? I love the color blue. Do you know who else loves the color blue? SilverStone. How do I know? Well, cast your gaze upon the packaging for the SilverStone SX800-LTI and all of its blue wonder. Now, I'm not sure what blue has to do with an 800W SFX-L power supply (I would probably have gone with something more aggressive given the amount of power we see in such a small package today but whatever) but the unit certainly does stand out in a crowd! Now, color aside, the packaging here is almost identical to what we saw from the SX700-LPT. The front of the packaging has a picture of the unit along with a chunk of advertising at the very bottom that contains text about a lot of the features that we see with each and every SilverStone unit we review. Additionally, we see an 80 Plus Titanium badge on the package and, when we check the 80 Plus website, we do indeed find that this unit is listed. Moving on, the rear of the packaging of the SX800-LTI has an efficiency graph, fan speed graph (which includes a fanless mode), advertising for low ripple/noise values with a stylized output from an oscilloscope, advertising for strict voltage regulation, 100% modular interface, flat cables, and advertising about the unit having a single 12v rail. Rounding out the information about features, we find the power table (reproduced below) and the connector count (reproduced below) when we look at the sides of the packaging. Lastly, we see that this unit is covered by a 3 year warranty. While some of SilverStone's products saw an increase in warranty support a little while back, the SFX (and apparently SFX-L) products were not included in that warranty extension.

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The power information for the SilverStone SX800-LTI is similar to what we saw from the SX700-LPT in some ways and different in some ways as well. With the SX800-LTI, we get a bit more power, obviously, but how we get there is interesting. In this case, the SilverStone SX800-LTI bumps the 12v capacity up to 66A (or ~99% of the unit's potential output) while the minor rails carry a combined capacity rating of 80W (which is a drop from the 120W we saw with the smaller SX700-LPT). Further, the minor rails have individual caps of 15A on the 5v rail and 16A on the 3.3v rail. Those minor rails outputs are quite a bit smaller than what we saw with the SX700-LPT individually, and together, which is perhaps not great as we see the same number of Molex connectors (3) but more SATA connectors (12) today. On top of that, we see that this unit also has four modified 8-pin PCIe connectors as was the case with the SX700-LPT. This is all interesting as with this arrangement the number of peripheral connectors may actually pose a bit of a problem for the minor rails capacity if they were all to be employed. To some extent this is unlikely (this power supply is meant for applications where space is limited so the number of drives and such would probably be as well) but it seems like an area that was not thought out as well as it could have been.

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Once we open the SX800-LTI packaging we find the unit, power cord, mounting screws, modular cables, and user manuals. One of the manuals that comes with this unit is 6 pages long in English only and the other is 56 pages long in 11 languages just as we have seen before. Among this 60+ pages of literature, we find the pin-out guide, power label, installation instructions, some trouble shooting steps, the very complete electrical specifications, and the warranty information. Now, what we don't see that is truly puzzling today is an ATX adapter plate for this unit. Much as was the case when we ran into this with the SX700-LPT, this is the EXACT kind of unit where an ATX adapter plate would be most likely to be used. So, the lack of one today is not what we would expect to see. Sure, you can buy one from SilverStone but that will set you back another $8-10 which isn't great. Let's move on and see how things look once we crack this unit open.