I don't want to sound like I'm plugging a particular company, but I buy RAM from crucial.com. They have a configurator on their site that lets you look your model, provides the correct RAM and even provides instructions on how to install it (I have no connection or financial interest in Crucial).

Depending on the kind of Mac it is, you'll have different methods of opening it up and finding the RAM bays where you'll either be replacing the RAM or possibly just adding to it. Be extra sure that when you open the computer and handle the RAM chips that there is no static electricity (the kind you get when you rub your feet on the carpet and then get a "shock" when you touch something or someone). To ensure that there is no static electricity, ground your self by touching the power supply of the computer before you touch anything inside it. Static and destroy your RAM and you computer. If you want to be extra sure, buy a static bracelet. You put it on and connect to something that is grounded while you're working on the inside of your computer.

I recommend installing the maximum amount of RAM that the computer is capable of using. Operating systems and Applications are always getting more complex and always demand more RAM. When you have the maximum amount of RAM, your computer will run faster.

Only handle the RAM chips by the edges. Be sure not to touch the surfaces.

Upgrading your RAM yourself is a very empowering experience. When you're finished, you'll feel confident and the confusing labyrinth of the inside of your computer will be demystified somewhat. Next thing you know, you'll be changing your own oil!
Source(s):
http://www.crucial.com/promo/index.aspx?prog=mfr_apple&cpe=pd_google_us...

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