To find out the maximum amount of RAM your iMac can handle, check out this Apple Support page. Go to the line that has the model identifier. To find the model number, go back to the main About This Mac tab and click the System Report button. Depending on which version of MacOS your computer is running, there may be a Memory tab you can click to view how much RAM you have and how many slots it's occupying. Also, look at the memory line to see how much RAM your computer already has.ĥ. For example, mine is: iMac (27-inch, late 2013).Ĥ. Look for either the year your computer came out or the model number. Identify your iMac model and max amount of RAMīefore you can install new RAM, you need to determine what kind of iMac you have. Instead, you have to take apart most of the iMac to add more. Unfortunately, if you have a 21.5-inch model made after 2011 or an iMac Pro, there isn't a way to easily access RAM. If you have a pre-2011 27-inch or a 21.5-inch iMac, there's an access panel in the bottom grille of the computer. Since late 2012, 27-inch models have a door behind the stand that gives you easy access so you can add more RAM. IMacs come in two sizes - 27-inch and 21.5-inch models. And you should pair RAM modules of the same capacity, if possible.27-inch iMac vs. If you decide just to fill empty slots, the same applies. It’s a good idea, though not essential, to buy all the RAM you fit at the same time from the same manufacturer. That will often mean removing the existing modules and replacing them. But as a rule of thumb, the effort of performing the installation compared with the marginal cost of bigger RAM modules means that it’s worth maxing out your Mac’s RAM in one go. How much RAM you add and how you add it is dependent on your Mac. If it turns red regularly, it’s worth the expenditure. If it’s permanently green, you’re probably not going to see a huge difference by upgrading. The easiest way to do this is to fire up Activity Monitor (it’s in Applications/Utilities), click on the Memory tab and keep an eye on the memory pressure gauge at the bottom of the window. Before you go ahead and spend money, however, it’s worth trying to figure out how much of a difference it will really make, if any. In the past adding more RAM was the go-to solution for improving a Mac’s performance.
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