As PC gaming continues to grow, more and more PCs are finding their way into the living room. As such, the demand for small, elegant computers that are powerful enough to be used as gaming machines is constantly on the rise. Several reputable manufacturers have presented products specifically designed for living room PC gaming, from subtle gaming cases to specialized keyboards/mice.

One major challenge with developing these small form factor (SFF) gaming systems is power. A gaming PC can require a lot of power, which can be an issue with cases that only support SFX PSUs. As the market for SFX units is very low and such systems were not expected to have high power requirements to begin with, there are very few designs available with a power output higher than 500 Watts.

SilverStone is a company that is strongly focused on the design and development of SFF cases, with several of their recent products designed to be used primarily as gaming machines. They are one of the very few companies that offer advanced, high performance SFX PSUs. In this review we are having a look at the SX700-LPT, their latest and greatest SFX PSU design. The SX700-LPT is 80Plus Platinum certified and has a maximum power output of 700 Watts, theoretically making it the most advanced consumer SFX PSU available today.

Power specifications ( Rated @ 40 °C )
AC INPUT 100 - 240 VAC, 50 - 60 Hz
RAIL +3.3V +5V +12V +5Vsb -12V
MAX OUTPUT 22A 22A 58.4A 3A 0.3A
120W 700W 15W 3.6W

Packaging and Bundle

SilverStone supplies the SX700-LPT SFX PSU into a relatively large cardboard box for an SFX PSU. The box is very sturdy and the PSU is sandwiched between thick polystyrene foam pieces, providing ample shipping protection. The most basic features of the PSU can be read at the front side of the box and more details are printed on the back.

The bundle of the SX700-LPT is spartan, with the company supplying only a manual, an AC power cable and four black mounting screws. The manual is extensive and detailed. SilverStone does not provide a SFX to ATX adapter with the SX700-LPT, which is peculiar considering that they do with less powerful units.

This is a fully modular design so every cable can be detached, including the 24-pin ATX cable. All of the cables are "flat", ribbon-like, including the thick 24-pin ATX cable. Apparently, SilverStone is trying to save as much space as possible. Be warned that these cables are much shorter than those of a regular ATX unit, with the ATX power cable being just 30 cm (11.8") long. Every cable is made by using black wires and black connectors, with the sole exception of the PSU-side connectors of the PCI Express power cables, which are blue.

SilverStone SX700-LPT SFX 700W
Connector type Hardwired Modular
ATX 24 Pin - 1
EPS 4+4 Pin - 1
EPS 8 Pin - -
PCI-E 6+2 Pin - 4
PCI-E 8 Pin - -
SATA - 9
Molex - 3
Floppy - 1
The SilverStone SX700-LPT SFX-L PSU
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  • Eden-K121D - Friday, September 30, 2016 - link

    Interesting product although I don't think anyone needs SFC PSUs of more than 500 Watts
  • edzieba - Friday, September 30, 2016 - link

    Yoiu can cram a Titan and a X99 CPU into a 7.2L case (Dan A4) or a pair of them and an X99 into the Kimera Cerberus (18L) or LukeD's Project Orthus (12L), which would push exisitn 500W SFX PSUs out of their comfort zone.
  • JoeyJoJo123 - Friday, September 30, 2016 - link

    Dan A4 can use an SFX-L power supply, but a Titan (Pascal) + X99 CPU don't exceed 500W during load.
    Kimera Cerberus does use an SFX-L power supply, and extreme configurations can pull up 700w.
    Project Orthus uses a 1U power supply. This power supply is incompatible.

    The point people are making is that this product is a solution looking for a problem. SFX(-L) PSUs are typically used in small, portable PC cases. 500W units are sufficient for any 1 CPU + 1 GPU system, which is the vast majority of systems. Very few people need something that exceeds that.
  • wolfemane - Friday, September 30, 2016 - link

    You are right, very few people need that. But there are those that may want to overclock both their CPUs and gpu's, and that can quit easily push power over 500w depending on the CPU, gpu, and overclock achieved in both. And doing all that in a small compact case is desirable by enough to bring a psu like this to market.
  • JoeyJoJo123 - Friday, September 30, 2016 - link

    Part of the problem with extreme overclocking in SFF is that (without introducing intolerable levels of noise) heat builds up very quickly in small volume. The typical SFF PCs, where SFX-L PSUs are typically used, has only intake fan(s) (if any case fans at all). So waste heat is dumped in a ~13 liter case (for cases like the ML07 or RVZ01 or FTZ01) and it can only passively leave the case.

    You can try to better force hot air out by using godly air pressure fans, such as the notoriously loud, high-rpm Delta fans, or the industrialPPC line of fans from Noctua, but you run into problems with noise generation.

    I speak from experience here because I'm using three Noctua NF-F12 industrialPPC-3000 PWM case fans in my FTZ01, and a i5-4690k @4.5Ghz and GTX 970 (stock clocks). While I'm able to control the temperatures of my CPU well enough, the GPU compartment is a different issue, and the GPU can routinely hit ~90 degrees C after an hour or two of gaming, where it begins to throttle a bit. Part of that is my fault, as I bought the cheapest GTX 970 available at the time, which was an open air cooler and as a result it constantly recycles the warmer and warmer air it exhausts, but I don't believe a blower style GPU would help too significantly, either. And this happens even with using very high-pressure and high-rpm fans to try to force in as much positive case pressure as possible, to get stagnant exhaust air out of the case; it just doesn't work too well for my GPU so I leave it at stock clocks and undervolt it a bit.

    SFF cases function best when GPUs aren't being overclocked, at the very least. They starve of fresh air too easily because the compromises of SFF cases don't allow the extra dimensions in the case to have enough case volume and fan (intakes and exhaust) to properly ensure that the GPU exhaust is leaving the case.
  • DanNeely - Friday, September 30, 2016 - link

    Whenever you do replace your GPU I think you really should go with a blower cooler. While they're justifiably much maligned by enthusiasts with big well ventilated cases for bad noise to temperature performance in their beasts, one of the reasons why reference designs generally use blowers is that they allow the card to vent all of its unwanted heat directly without having to worry about if the rest of the case is able to help any or not. Looking at your case I think the blowers intake should line up with the perforated area in the GPU compartment allowing it to suck fresh air in from outside the case directly and blast it out the back.
  • usernametaken76 - Saturday, October 1, 2016 - link

    It's not "all" it's "most."
  • Vayra - Monday, October 3, 2016 - link

    Airflow and case cooling isn't rocket science. With only intake and open air GPU and CPU cooling things will get hot. All it takes is air *flow* my friend. One exhaust fan or a smart placement of a large CPU fan can already do the trick, you can waste however much you want on super expensive case fans that push a ton of air but if there is no exhaust, it's gonna fail.

    Flow of air (in-to-ex) > GPU cooler style (open > blower) > case fans.

    Stick to that order for your next system in terms of cooling priority. Money better spent, lower temps.
  • TheinsanegamerN - Monday, October 3, 2016 - link

    Never heard of positive air pressure? If you have fans only blowing in, plenty of heat will come out. Unless you sealed your entire chassis with duct tape.

    Also, LOL at a single GPU or CPU fan keeping up with the input of multiple case fans. Airflow doesnt work the way you think it works.
  • JoeyJoJo123 - Monday, October 3, 2016 - link

    I don't believe you have any idea what you're talking about. The case is designed to have three fan placements, all designed to be intake-only. Additionally, the FTZ01 comes with fine-mesh fan filters.

    There is lots of air going in. The problem is that warm air doesn't leave as quickly as it is generated, and gets trapped in small compartments inside the case. After several hours, it gets very toasty inside the small enclosure.

    This has nothing to do with my intelligence or the way I built the system, that's the _design_ of the case.

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