Supermicro to ATX Power Supply Adapter

Mount a redundant Supermicro PSU in an ATX chassis

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This project was built specifically to fit a Fractal Define S2 chassis.  The Define S2 chassis is both long enough and has a mount on the bottom for a 240mm radiator.  This radiator mount is repurposed to be a mounting point for the PSU adapter.

Everything you see here was printed using a Prusa MK3s and Prusament PETG filament.  Every piece of this design prints well without any supports.  If you print a single copy of each object, you will probably exhaust an entire 1 Kg spool of filament.

  • 1
    Purchase and strip the Supermicro Power Distribution Board (PDB)

    Go out to eBay and find this PDB:  Supermicro PDB-PT825-36824 SC825.  It features three GPU power cables.  Each GPU cable has a one 8-pin and one 6+2 pin connector.

    After this PDB arrives, strip off the metal plate.  You won't need it.

  • 2
    Purchase two Supermicro power supplies

    The Supermicro PDB-PT825-36824 is a "23-pin" model and will accept both the 23-pin supplies and the 19-pin supplies.  This is not an exhaustive list, but just the various models that I had sitting at home that I know fit into the PDB-PT825-36824.

    23-Pin Model Numbers

    19-Pin Model Numbers

    If you choose to find a model that is not listed above, you should start by looking at the Supermicro Power Supply Matrix.  The only supplies that will physically fit have these dimensions:

    • Length (mm) = 336
    • Width (mm) = 76
    • Height (mm) = 40

    Unfortunately, the matrix doesn't tell you which supply is 19-pin and which is 23-pin.  However, if you do a Google search like this:


     Then you will get as your top hit this link:

    Scroll down to the 'Detailed Specification' tab, then look for "Output Type    Gold Finger (23 Pair Connector)".

    I am using two PWS-1K28P-SQ supplies:

  • 3
    Purchase an ATX power cable extension kit

    If you look at Step #1, you will notice how the 24-pin and dual EPS12V cables are extremely short.  If your motherboard has its 24-pin connector at the top of the board, you will need a 50 cm extension.  If your motherboard has its 24-pin connector on the side, a 30 cm cable will work.

    I purchased a 50 cm extension kit because my ASUS Pro WS x570-ACE motherboard has a single EPS12v connector on top.

    My cable extension kit:  Amazon - LINKUP

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