
Note the ATX Form Factor standard was created specifically by a consortium of hardware makers who all agreed on various industry standards to include size, shape, connections, voltages, even mounting hole locations and screw types for the very purpose of allowing products from any manufacturer to be compatible (electronically and mechanically) with products from any other manufacturer. Then bending the prongs back straight again often resulted in them breaking off either then, or when bending back to secure the new board. That worked until you wanted to remove the board. These prongs were then bent over to hold the motherboard in place. Instead, there were metal "tines" or "prongs" that were punched out of the sheet metal where the motherboard mounting holes were.


I note some old Dell systems didn't use standoffs or motherboard mounting screws. Click to expand.But even that can greatly limit upgrade options - depending on the case.
