Unlike the more flexible ATX solutions, the SilverStone SX600-G SFX PSU is a rather narrowly focused product, designed for a very specific group of users. Frankly, the number of users that would even want a 600 Watt PSU inside their tiny desktop/SFF case is very small, let alone the number of those users who could use that much power given the component limitations imposed by such small case dimensions. Which is not to say that there's not a place for a 600W SFX PSU, only that it's definitely a niche role on the whole.

Unsurprisingly then, for this 600W unit SilverStone is trying to expand their customer base a little bit with the inclusion of the SFX to ATX frame adapter. After all, even if a small form factor case can take a full size ATX PSU, a very compact design might benefit from the presence of a smaller SFX PSU. Unfortunately in trying to serve two masters, Silverstone's included modular cables are still designed first and foremost for the smaller SFX form factor, meaning that they don't offer much slack for actually reaching an ATX motherboard. We fell victim to this as well, during our recent review of SilverStone's own Fortress FT05. Despite the small proportions of the case, the CPU power connector could not get anywhere close the motherboard header.

Meanwhile when it comes to performance, it would be entirely unfair to compare the SilverStone SX600-G to any ATX PSU and, frankly, we do not have enough data to compare it against any other SFX PSU either. High performance SFX PSUs are quite rare, and most are built by Enhance anyway.

What we can point out however is that the SilverStone SX600-G SFX struggles to deliver its maximum power output inside a hot environment and, unlike a good gaming tower case, we do expect a small desktop/SSF case to get rather warm given the lack of airflow in most home A/V cabinets. In a hot, enclosed space, the PSU struggles to meet its efficiency certification levels and the power quality is, to put it mildly, not good. As one might expect noise levels in hot conditions are not very good either, as the included 80mm fan has to work rather hard to keep component temperatures in check.

What this means is that the SX600-G is not a very forgiving PSU. If put in a well ventilated room temperature environment the PSU does well enough, you just need good ventilation to start with. Particularly if driven to its full capacity, great care needs to be taken to make sure that the SX600-G and the system it's placed in are well ventilated in order to get suitable performance out of the PSU (and likely the rest of the system as well)

Ultimately there were clearly some tradeoffs made to get a 600W PSU into such a small form factor design, with ambient temperature sensitivity being chief among them. If we were to compare its performance with an average ATX PSU retailing for half the price, the SX600-G clearly falls short. It is not however made to be compared to ATX units, and rather this is one of the highest outputs you can get in the SFX form factor.

Moving on, the quality of the SilverStone SX600-G SFX PSU is troubling at times as well. Enhance does a fine job as an OEM and we have no complaints about the design or the quality of the assembly. For the most part, the quality of the components is good. The active components are of good quality and the primary capacitor is supplied by a very respectable manufacturer. When we check the secondary components however, it is pure chaos, with the capacitors being supplied by over half a dozen manufacturers despite the fact that this is a small SFX PSU.

Of course, the number of suppliers means very little. The fact that many of them are not exactly favorites among enthusiasts however, does. Most of those versed in power electronics would agree that products from, for example, Su'Scon and Elite, are not exactly ideal for what is supposed to be a high performance $130 product. For what amounts to a premium retail price, one would expect better quality. Then again, we can only imagine what it would do to the already premium price of the PSU if Silverstone went with even more expensive top class components.

Wrapping things up, although it's not perfect, the SilverStone SX600-G SFX PSU is still going to be the PSU of choice for those that need a high power output inside a very confined environment. It comes at the steep price of $130 including shipping, but there is virtually no other product that can match its power output in such a small size. But with that said, this is a PSU best reserved for SFX form factor users. If a case can accept a normal ATX PSU, an ATX PSU is probably the better and cheaper option.

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  • meacupla - Friday, August 21, 2015 - link

    From personal experience, the SATA cables they include aren't suitable in their own cases, at least not in RVZ01.

    Right angle SATA connectors are completely inferior compared to straight ones inside cramped cases, because the "T", that theconnector forms with its cables, gets in the way more often than not and causes a lot of stress onto the drive connector or the cables.

    The right angle SATA connectors are so bad, in fact, that I am forced to use 4-pin molex to straight SATA cables, which adds further clutter inside an already cramped case.
  • edzieba - Friday, August 21, 2015 - link

    The downside of straight connectors is that you now need to accommodate the Minimum Bend Radius behind the drive for the cable to make a 90° turn (extra wasted space), and you need to run DOUBLE the number of actual wires through the case (due to the lack of daisy-chaining).
  • meacupla - Friday, August 21, 2015 - link

    no you don't? There are daisy-chained straight SATA connectors. This was a pretty standard type of connector found on older PSUs, but for some reason, I haven't seen many, and by that I mean none, these days.

    This is the perfect solution, daisy chain straight connectors:

    You see, the problem with right angle connectors, is that you need accommodate the minimum bend radius between the drives anyways, because these connectors aren't spaced to the typical drive spacing.

    And also, I would like to stress that 'right angle' power connectors are the 'wrong angle' in RVZ01. The 2.5" drives are belly up. The "right" angle connectors protrude above the side panel.
  • Margalus - Friday, August 21, 2015 - link

    both types of connectors suffer from the same problems with Minimum Bend Radius, just in different situations.

    as for daisy chaining straight connectors, I haven't seen one with several straight connectors, I don't see how that would even be possible. The one you show just shows a single connector at the end like typical straight connectors, not several daisy chained together like you can have with the 90° cables.

    not saying 90° cables are better, or that straight cables are better. they both have their uses.
  • geniekid - Friday, August 21, 2015 - link

    More SFX/SFX-L reviews!
  • Flunk - Friday, August 21, 2015 - link

    So in summation, if you want a 600W SFX power supply you have to buy this one.

    About the cables, Silverstone uses the same standard for all their modular cables and has for quite a while. They offer a wide range of replacement cables in different lengths and even single cables. Not only that if you buy a bunch of their power supplies you end up with a bunch of extra cables. That's a great reason to keep buying their products. The last 4 power supplies I've bought were Silverstone, mostly so I can mix and match cables with my existing collection if I need a longer/shorter one.
  • meacupla - Friday, August 21, 2015 - link

    Actually, Athena Power has a bunch of SFX PSUs that are over 600W and they even have an 800W model.

    Silverstone is also going to release a 700W model of their SST-SX500-LG, although, strictly speaking, these "Long" models don't conform to SFX standards.

    Personally, I don't see how or why you would want more than 500W, because I'm quite sure you would run into thermal issues with a CPU+GPU that would require that kind of power in a case these SFX PSUs are designed to go in.
  • BrokenCrayons - Friday, August 21, 2015 - link

    First off, thanks for reviewing power supplies of lower wattage and it's great to see Anandtech taking a look at SFX PSUs in particular. Not all of us are interested in 1000 watt supplies so the variety is great.

    But I did notice..."The OEM behind the *very* densely packed design you see below is Enhance. Enhance is not a *very* common manufacturer for *very* high output PSUs..." this review contained a lot of "very" and "relatively" which hurt readability somewhat.
  • Ryan Smith - Friday, August 21, 2015 - link

    Yeah, we did go a bit overboard there. Thanks for pointing it out.
  • ruthan - Friday, August 21, 2015 - link

    2 year ago i looked for SFX PSU and only choice was Seasonic 300W and even with 30W power outcome was noise. So i moved into expensive picoPSU and after that for second very small machine i selected board with laptop like external adapter connector and adapter bundled with Akasa Euler S.
    Usually if you case about size, you want to have machine near of you and it means machine should be quiet.. So for smaller power consumation (<200W) machine there are better laptop like solution and for bigger machines is still ATX PSU needed.. or maybe there are some niche never where reviewed extendar passively cooler 300W boxes.. - but there are not small, so..

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