On a regular PC, with Windows or Linux installed, this is done automatically for the user during the OS installation based on a few conditions like: “Is this a Desktop or Laptop computer?”, “Which CPU and GPU model it has?”, “Is the GPU integrated or not?”. In fact the model number it’s a crucial parameter which “tells” to the operative system what type of computer you’re using. Choosing the model number for your Hackintosh setup is not a cosmetic reason, not the only reason at least.
