![]() Either way, this type of information can be useful for hardware upgrades, though it should be noted that Mac OS X makes memory upgrades easy by showing you what type of RAM and the capacity as well for any specific machine, assuming the Mac can be upgraded anyway. You’ll often find that simply knowing and finding the model year of when a Mac was built is sufficient, but sometimes services and sites will reference a model identifier number instead. This is the same in all modern versions of MacOS and Mac OS X, as is the System Information app. A Media Access Control address (MAC address) is a unique identifier assigned to network interfaces for communications on the physical network segment. ![]() Each network device aka wired or wireless has its own hardwired mac address and this can be changed via software on some models. The Model Identifier will always be a name and a numerical sequence following the “Model Name and Model Number, Model Revision” syntax as already mentioned, this can look something like “iMac9,3” or “MacBookAir3,1” amongst many others. Nothing whatsoever to do with Serial Number.
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