Mounting system for printed circuit boards

An information processing device comprising:

• a chassis;
• a mounting system comprising:
• a plurality of cylindrical standoffs, each comprising:
• a first end coupled to the chassis and a second end opposite to the first end having a fastener hole;
• and
• multi-tiered shoulders formed between the first and second ends and configured to interchangeably receive respectively compatible printed circuit boards (PCBs), each shoulder of the multi-tiered shoulders comprising an upward facing mounting face, where respective mounting faces of the shoulders have different heights and different outer radii relative to one another such that the shoulders are respectively compatible with different ones of the PCBs having different PCB thicknesses and different mounting hole diameters;
• a plurality of fasteners;
• and
• a first PCB having a first PCB thickness and a first mounting hole diameter compatible with a first shoulder of the shoulders, wherein a bottom face of the first PCB is engaged with the mounting face of the first shoulder of each of the plurality of cylindrical standoffs, and
• wherein each fastener of the plurality of fasteners extends through a corresponding mounting hole of the first PCB and into the fastener hole of a corresponding standoff of the plurality of cylindrical standoffs and engages a top face of the first PCB to releasably attach the first PCB to the chassis.

A riser assembly comprising:

• a riser cage;
• a mounting system comprising:
• a plurality of cylindrical standoffs, each comprising:
• a first end coupled to the riser cage and a second end opposite to the first end having a fastener hole;
• and
• multi-tiered shoulders formed between the first and second ends and configured to interchangeably receive respectively compatible riser cards, each shoulder of the multi-tiered shoulders comprising an upward facing mounting face, where respective mounting faces of the shoulders have different heights and different outer radii relative to one another such that the shoulders are respectively compatible with different ones of the riser cards having different riser card thicknesses and different mounting hole diameters;
• and
• a plurality of fasteners, and
• a first riser card having a first riser card thickness and a first mounting hole diameter compatible with a first shoulder of the shoulders, wherein a bottom face of the first riser card is engaged with the mounting face of the first shoulder of each of the plurality of cylindrical standoffs, and
• wherein each fastener of the plurality of fasteners extends through a corresponding mounting hole of the first riser card and into the fastener hole of a corresponding standoff of the plurality of cylindrical standoffs and engages a top face of the first riser card to releasably attach the first riser card to the riser cage.