SilverStone SFX SX650-G 650W Power Supply Review

Author:Paul Johnson

Editor:Kyle Bennett

Date: Monday , July 02, 2018

SilverStone is back with us today with its new small form factor SX650-G. This one has a bigger fan and a few more connectors than the previous models, so we are expecting great results from this SFX PSU. This one clocks in at 819 watts per liter and does carry a gold efficiency rating. Flat shorty cables are stock with tiny builds in mind.


The first thing we are going to look at with the SilverStone SX650-G 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.

The packaging for the SilverStone SX650-G looks just about identical to that of the SX500-G save for the difference in capacity. This means that the front of the tiny (it is an SFX Unit after all) packaging is dominated by the superimposed image of the power supply and then trimmed out in gold. Along the bottom of the package, we see a pair of columns of advertising that includes things such as "Class-leading Single +12v rail", "100% modular cables", "Strict 3% Voltage Regulation and low ripple and noise", "Silent running 92mm fan with 18 dBa minimum", etc. We see an 80 Plus Gold badge which, when we flip over to the 80 Plus website, we do indeed find to have been given by ECOS/ECOVA. Moving on to the rear of the packaging of the SX650-G, we see an efficiency graph, fan speed graph, and advertisement for low ripple/noise values with a stylized output from an oscilloscope just like we saw with the SX500-G. The rest of the packaging houses the power table (reproduced below) and the connector count (reproduced below) on the sides. Lastly, we see that this unit is covered by the same short 3 year warranty we have seen from a number of previous SilverStone units (though not all as SilverStone has upped their warranty on certain products).

The power information for the SilverStone SX650-G is similar to what we have seen from SFX form factor power supplies from SilverStone in the past and modern power supplies in general. Today, we see that the SX650-G has a 12v capacity of up to 54.2A (or a bit more than ~100% of the units potential output) while the minor rails carry a combined capacity rating of 110W. The minor rails have individual caps of 22A each and the +5vsb has a capacity of 2.5A. These output capacities are coupled with three Molex, six SATA, and four modified 8-pin PCIe connectors. Perhaps the most interesting thing here is the fact that this unit has four PCIe connectors. On a standard SFX form factor unit, likely to be used in scenarios where space for components will be very limited, it seems that this arrangement may be a little excessive but at least users can't complain about there not being enough PCIe connectors!

Once we open the SX650-G packaging we find the unit, power cord, mounting screws, modular cables, and user manuals. One of the manuals that comes with this unit is 10 pages long in English only and the other is 60 pages long in 10 languages just as we have seen before. Among this total of 70 pages of literature, we find the pinout guide, power label, installation instructions, some trouble shooting steps, the very complete electrical specifications, and the warranty information. Overall, SilverStone continues to provide some of, if not the, best documentation going and it is always pleasure to get real documentation with their units.