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
TOTAL 1200W

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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  • DigitalFreak - Friday, October 11, 2019 - link

    It's probably a baffle to direct airflow. Reply
  • GreenReaper - Friday, October 11, 2019 - link

    I've seen this a lot on PSUs; the fan must be circular, but you need the airflow in a more rectangular section over the board where the components are. Reply
  • Cellar Door - Friday, October 11, 2019 - link

    Most power supplies have that, why are you surprised? Reply
  • Death666Angel - Friday, October 11, 2019 - link

    It's been that way in all the PSUs I've taken apart. When I stopped to look at it, it was always infront of the beefy mains capacitors. Probably to stop someone from poking a screw driver in there and shorting a capacitor that still has a charge. Reply
  • 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. Reply
  • RealBeast - Friday, October 11, 2019 - link

    I've used a lot of SilverStone smaller (450-550W) units in small builds and been very happy, but would be hard pressed not to opt for a larger case and go with a Seasonic in this range. Reply
  • C@mM! - Friday, October 11, 2019 - link

    I had both the last 1200w & a 850w Platinum from Silverstone die on me, whilst I applaud the size, they really needed to up their game on the PSU before making it smaller again. Reply
  • tygrus - Friday, October 11, 2019 - link

    It's like having a 600w PSU with turbo boost upto 1200w. A 900w version with a bit more free space & easier airflow would be better for some users. Future versions may improve efficiency so you can run at higher loads without the hairdryer noise. Reply
  • The_Assimilator - Saturday, October 12, 2019 - link

    Since SLI and Crossfire are dead, the only people who care about PSUs able to supply over a KW are miners and extreme overclockers - neither of which have a use for mITX chassis. So, this is a product looking for a market, which is not exactly a formula for success. Reply
  • PenGunn - Saturday, October 12, 2019 - link

    I made an account for this. You just get the Seasonic that fits your purpose, no need for heavy thinking. ;) Reply

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