The power supply, the backplate, the spacing of the mounts for the motherboard, and the position of the expansion slots in relation to the CPU
For sure, it is the Motherboard, the Power supply, and the Chassis that determines the form factor of a computer.
The mother board, power supply, and chassis
Form Factor
Social systems are lines between the ecosystem, biological organisms and psychical systems as well as technical systems. They all together form the environment of social systems.
Component testing
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power supply
Case System Unit Form Factor
BTX. This from factor was designed by Intel in 2003 for flexibility and can be used by everything from large tower systems to those ultra-small systems that sit under a monitor
1) In computers, the form factor (sometimes hyphenated as form-factor) is the size, configuration, or physical arrangement of a computer hardware object. The term is commonly used in describing the size and/or arrangement of a computer case or chassis or one of its internal components such as a daughterboard .
The Mini ITX motherboard is only used within one computer system. It is used for small form factor or SFF computer systems. It enables an infinite development amount of SFF computer systems.