External Appearance

While the SX700-LPT obviously is very small compared to an ATX PSU, it does not actually adhere to SFX specifications either. It is being labeled as an "SFX-L" design, with its chassis measuring 125 × 63.5 × 125 mm (W×H×D). Essentially, it is 25 mm longer than a standard SFX PSU. The longer chassis allowed SilverStone to fit more components and a 120 mm cooling fan, but it could very easily cause compatibility issues with some cases that do not have any extra space behind the PSU.

The chassis is sprayed with a satin black paint that is fingerprint resistant. Oddly, SilverStone punched their company logo along the top side and placed the sticker with the electrical specifications and certifications on the left side of the chassis. It is likely that the company expects the top of the PSU to be more frequently visible than its side, but such aesthetic improvements are of questionable value on such products, as cases that require SFX PSUs rarely have windowed panels anyway.

The rear of the SX700-LPT is somewhat interesting in its own way. There is only an AC cable receptacle and an on/off switch, yet such a switch is relatively rare on SFX designs. The connectors for the modular cables can the seen at the front side of the unit, with the PCI Express cable connectors being blue and every other connector being black.


Internal Design

Zhen Poweryear is the supplier of the thin 120 mm fan found inside the SX700-LPT. It has a black frame but semi-transparent tinted blades. We could not find specific information on the PY-12015H12S, but it appears to be a sleeve bearing engine fan and has a maximum speed of about 1700 RPM.

Most of SilverStone’s SFX PSU designs come from Enhance, but this is not the case with the SX700-LPT, which is a Sirfa design. Naturally, everything is very densely packed due to the limited space, but the design is actually very clean for a high power SFX unit. The filtering stage begins at the back of the AC receptacle and continues on the main PCB, with four Y capacitors, three X capacitors and two filtering inductors in total.


The heatsink at the far right side of the PCB holds the active PFC components, two transistors and a diode. Rubycon supplies the PFC 420V/390μF capacitor. The main inversion stage is a half-bridge configuration with two MOSFETS, which are found on the heatsink near the center of the design. The secondary side conversion MOSFETs are at the underside of the PCB, while DC to DC conversion circuits can be seen on the vertical daughterboards. Nippon Chemi-Con supplies all of the secondary capacitors, electrolytic and solid-state alike.


Introduction, Packaging & Bundle Cold Test Results
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  • usernametaken76 - Friday, September 30, 2016 - link

    There's no edit feature, that should have read "one on a 120mm rad and the other on the case."
  • Samus - Saturday, October 1, 2016 - link

    That's true, I never thought of peak/spike draw. That has been an issue on AMD cards recently because their power circuitry cuts corner presumably on capacitance. This surges the PSU.

    However, I just can't imagine a single CPU system with any video card needs more than 500 watts, but there are obvious exceptions especially when overclocking or running more than a single drive.
  • usernametaken76 - Saturday, October 1, 2016 - link

    There are 425W BIOS mods for the original TITAN X. I had one. It's definitely needed in some cases.
  • xenol - Monday, October 3, 2016 - link

    I don't see how that adds up considering the PCIe connectors should only be able to supply (within spec) 300W.
  • TheinsanegamerN - Monday, October 3, 2016 - link

    WITHIN SPEC is the key there. People flashing higher TDP mods to GPUs are running everything out of spec. That's the definition of overclocking.
  • BrokenCrayons - Monday, October 3, 2016 - link

    At the point where you're using a Titan, overclocking everything, and intentionally raising TDP limits, you're probably not putting your parts into an SFX case and probably not going to need to worry about the wattage limitations of power supplies available for that platform. That situation is at the extreme end of halo computing and represents a very small number of systems. People doing those things presumably understand what they're doing, but we're still talking about a very small portion of actual computer users.
  • gopher1369 - Saturday, October 1, 2016 - link

    "[I'm] seeing max load at the wall peaking at 290w"

    Assuming your PSU is 85% efficient then 290 x 0.85 = 246.5 Watts consumed.
  • wolfemane - Saturday, October 1, 2016 - link

    Aaaaaaaaand your point being? Not sure I understand the relivence of your post. Maybe to make a minor grammatical correction and show off your math skills? Bravo I guess
  • xenol - Monday, October 3, 2016 - link

    And so was I, and the most it spiked up to was 250W.
  • Stuka87 - Friday, September 30, 2016 - link

    Its only rated for 40C?! That is not that hot, its very easy to get the insides of a PC case that high during heavy gaming.

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