I have several iMacs at my workplace where I'm tasked with upgrading the RAMs of these. I have several questions regarding this process.

  1. Can I mix 4 GB sticks with 8 GB sticks?
  2. Do I need to respect the PC3-10600 specification or could I install a PC3-12800 stick to a model that says it needs 10600? Can I mix these, like having 10600 in two slots and 12800 in the other two?
  3. What does unbuffered and nonparity mean? Or more precisely, how to make sure a specific model I find available online conforms to these requirements? E.g. this documentation for a Kingston stick does not at all mention these properties as far as I was able to decipher the document.

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