Supermicro SC846 ATX PSU Mount

SC846 ATX PSU Mount

For those of us who have removed the rackmount PSU that comes with the Supermicro SC846 chassis and replaced it with an standard ATX PSU for quieter operation, the ATX PSU is usually left to just rest inside the case.  Even more annoying are the 7mm tall pins at the base of the chassis that don't let the PSU sit flush on the bottom.

This model raises the PSU off of the chassis keeps it from sliding around.  It uses two #6-32 3/16" (4.71mm) screws to secure the PSU to the bracket using 2 of the standard ATX PSU mounting holes.  It also uses two motherboard stand-offs (also #6-32 3/16") and screws to hold the bracket to the chassis floor.

It will fit any PSU up to ~164mm in depth.

PSU Shroud

An optional PSU shroud can be added starting with V17 of the PSU bracket.  This closes of the back portion behind the PSU and allows for better dust management. 

Installation Notes:

The PSU can be assembled onto the bracket and secured with two #6-32 3/16" screws outside of the case.  Starting with V17, the optional PSU shroud can also be attached to the PSU.

The shroud is printed in two pieces.  The Top can be secured to the top two #6-32 3/16" screws on the PSU.  The top must be secured to the PSU first before attaching the Side piece to allow for clearance of your screwdriver.

The side wall can then be inserted into the Top and into the PSU Mounting Bracket. This is a pretty tricky fit and requires you to flex the plastic quite a bit – this will be addressed in a future revision.  Once installed, the entire unit can be placed into the chassis and slid into the proper position over the motherboard stand-offs.

The last two #6-32 3/16" screws can now be screwed into the PSU bracket, securing it to the motherboard stand-offs.

The shroud contains two holes that can be used to hold the shroud from outside the case. Neither of these holes are threaded, but they can provide support for the shroud if the screw is inserted for the shroud to rest on:

• On the right side, there is a screw #6-32 that can be inserted near the rear of the case.  Use a ¼" fat head screw for best results.
• Towards the rear, there is a removable plate that has a screw that can be used to help support the shroud.

The PSU will interfere with one of the standard rear 80mm fan brackets.  Alternative mounts and brackets are available that are lower profile and support the Noctua NF-A8 80mm fan.

Changelog:

PSU Mount:

• V15: Make mounting “feet” wider to allow for base to slide into place.  This makes it easier to install PSU.
• V16: Route out area under feet allow more range of motion when sliding the PSU.  This allows you to assemble the PSU Shroud first before putting it in the chassis.  Also, add mounting clip to attach the PSU Shroud side bracket.
• V17: Route out more area under PSU Mount to allow the mount to be slide into place after assembling it onto the PSU.  Pins have been added to attach the Shroud Top and Side.
• V18: Moved the location of the pin for Shroud Side to attach to the PSU Mount for easier assembly.

PSU Shroud Top & Side

• V6B: Added pins that attach the Side to the Top and the PSU Mount.
• V7: Moved the location of the pin for Shroud Side to attach to the PSU Mount for easier assembly.  Increased the length of the Shroud Top and Side slightly to provide a better fit.

WARNING: PSU Mount V18 and PSU Shroud V7 are untested.