One of the many great outcomes of the general push towards small form factor (SFF) systems is that it has encouraged hardware developers to rethink size across all of their products. Does a video card really need to be longer than a sub sandwich? Does a laptop need to be two inches thick? Does a computer case need to be two feet tall? Sometimes the answer to those questions is still yes; but in other cases it turns out there's room for improvement – or rather, there is room to trim. And, as we're going to see today, this applies to power supplies as well.

SilverStone is a company known for their interest on the development and marketing of small system components, with their R&D department continuously releasing unique case designs and high-performance parts designed with reduced dimensions in mind. The company is also very active in the power supply unit (PSU) market, with a long track record and currently offering dozens of products. Their engineers are very experienced on the design and development of advanced PSUs, continuously setting new milestones, such as with the recent release of the 800W and 1000W SFX-L designs.

So perhaps it's only fitting that SilverStone has introduced one of the first 1200W power supplies that is actually ATX-compliant, in the form of the Strider Platinum ST1200-PTS.

Now, to be sure, there are plenty of 1200W power supplies on the market. However, technically none of these PSUs actually comply with the base ATX standard. ATX, the heart of the desktop computer as we know it, officially calls for power supplies to be 140mm in length. For practical purposes that requirement is frequently ignored in high-end builds – high-power PSUs have needed more space, and big cases have made sure to give them just that – but it none the less has a limiting effect on just what options are available for building a high-power system. Until recently, you couldn't have a high-capacity PSU in a case that didn't go beyond the ATX specifications.

SilverStone, with their Strider Platinum ST1200-PTS, is looking to change that. The latest addition to the company's PSU designs, it is the upgrade of the Platinum ST1200-PT that we received and reviewed last year. For the S(mall) version of the PSU, the company’s engineers have reduced the length of the chassis by an astounding 40 mm – bringing it down to 140mm in length – allowing the 1200W PSU to fit into any ATX-compliant case.

Power specifications ( Rated @ 40 °C )
AC INPUT 100 - 240 VAC, 50 - 60 Hz
RAIL +3.3V +5V +12V +5Vsb -12V
MAX OUTPUT 25A 22A 100A 3A 0,3A
120W 1200W 15W 3,6W

Packaging and Bundle

The new Strider Platinum ST1200-PTS PSU comes in an aesthetically simple but very functional cardboard box that is small enough to hint the dimensions of the included unit. It is a very sturdy box and additional foam layers provide excellent shipping protection. There are plenty of technical details and information printed on all sides of the box.

Inside the box we found a relatively rich bundle, consisting of a detailed user's manual, a thick AC power cable, black cable ties, a few short cable straps, a set of black mounting screws, a set of black thumbscrews, and a magnetic nylon fan filter. The fan filter is meant to protect the PSU from dust but it can be placed anywhere on the case if the PSU's compartment already features a filter.

SilverStone is using flat "ribbon" type cables, made using all black wires and connectors. This includes the ATX cable and the CPU/PCI-E 12V connectors. The only exception at the blue connectors at the PSU side of the PCI Express power cables. The ATX cable is made of several smaller ribbons bundled and secured together, forming a sort-of round cable.  

SilverStone ST1200-PTS
Connector type Hardwired Modular
ATX 24 Pin - 1
EPS 4+4 Pin - 2
EPS 8 Pin - -
PCI-E 6+2 Pin - 8
PCI-E 8 Pin - -
SATA - 8
Molex - 6
Floppy - 2
The SilverStone Strider Platinum ST1200-PTS 1200W PSU
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  • EdgeOfDetroit - Friday, October 11, 2019 - link

    A quick google search says $270. How many people who require a small chassis (but not rack-mount) also require high-wattage and would be willing to pay for this? I'm sure there are some, but it seems to me I'd rather pay a bit less, get an equal quality and capable power supply that dares to exceed ATX in this one way, and buy a chassis that permits that.
  • Death666Angel - Friday, October 11, 2019 - link

    In German it is 203€ from a reputable retailer. It is within 10€ to 20€ of units that are 190mm or 200mm deep and from reputable manufacturers and retailers (Cooler Master, Enermax, Corsair). The price and performance is pretty reasonable to me. This might make a sick mATX TR3 system with dual GPUs in a (comparitively) tiny form factor. I'd dig it.
  • CheapSushi - Friday, October 11, 2019 - link

    I am willing to pay for it. I think all consumer/prosumer PSU's should be SFX or SFX-L already regardless of case size, racking mounting (all mine are Rosewill 4U chassis) or even motherboard size (all mine are ATX and EATX).
  • AlyxSharkBite - Saturday, October 12, 2019 - link

    I agree I have a hard time picturing a SFF PC needing a 1200W PSU. Even if it was an i9-9980XE and a 2080Ti build.
  • patrickjp93 - Sunday, October 13, 2019 - link

    While "I" wouldn't run such a setup, I do know a guy with a dual-Epyc board and 4 Nvidia Teslas who uses this.
  • notashill - Monday, October 14, 2019 - link

    Is he using it because the case actually can't fit a bigger PSU? I am finding it hard to imagine anyone designing a case that can fit an E-ATX motherboard and 4 GPUs but can't fit a "normal" 1200W PSU.
  • bigboxes - Monday, October 14, 2019 - link

    Haha! Exactly. If you have a case that fit an EATX Mobo and 4 GPUs then you most definitely can fit an ATX psu
  • tonyou - Monday, October 14, 2019 - link

    We have two 33-34 liter sized HTPC cases capable of fitting true SSI-EEB level E-ATX motherboards and multiple cards that could benefit from a shorter PSU:
  • Tams80 - Monday, October 14, 2019 - link

    You might want to read up on power curves and power efficiency.
  • CheapSushi - Friday, October 11, 2019 - link

    It's so minor but I wish they went with a black PCB and I really don't like the blue connection ports, although I realize it's their "signature" branding. You don't see the PCB often but this is a high quality enthusiast PSU and nearly all of the same class us black PCBs; it fits the market better than the generic server / "don't care" green PCB. But I love to see more SFX & SFX-L PSU's. And yes, I really do want to use that size for all my ATX & EATX motherboards and all my cases, regardless of size, even my 4U Rosewill chassis. Lets continue to move forward with density & design improvements in the PSU realm, not just CPU / GPUs. It sucks just how long it takes for people (not even just companies) to stop doing things just because they're so used to doing it a certain way and then become naysayers when such products come now. They product is very welcomed in my opinion.

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