Different Mac models use different types of RAM, …

>Different Mac models use different types of RAM, and each also supports a different maximum level of RAM. Unless you spend a lot of time upgrading and repairing Macs yourself, you probably don’t know these exact details off the top of your head, and that’s just fine because the information can be retrieved directly from the Mac in most cases.

[Find What Type of RAM a Mac Uses & the Maximum Supported Memory](http://osxdaily.com/2013/07/03/check-mac-ram-type-maximum-capacity/)