Today I will be performing a RAM upgrade for an iMac, mid 2007 version. Now, usually RAM upgrades can be very annoying, especially on Macs where you needs a certain type of RAM, as well as a certain amount. On PCs it is not so annoying as you can put any type in, just has to fit the socket, and you can usually have upwards of 8GB of RAM. Older Macs, like the one I am performing the upgrade on, can only hold about 4GB of laptop RAM. That is one of the reasons the iMacs are so thing, because they use laptop RAM instead of desktop RAM. So how was I to figure out the speed and type of RAM to use? Well, one way would be to use Crucial.com, and search out my RAM using their special RAM finder. Or, in Lion, I could go to "About this Mac" and find out. That is what I did.
From the example above, you can see what type of RAM is needed. In this case, it is two sticks of 667 Mhz DDR2 SDRAM. However, if you notice in the bottom right corner, there is a button that says "Memory Upgrade Instructions". If you click on that it will take you to an Apple support page which not only tells you how to upgrade your RAM, but also the maximum amount you can put in your computer. That is how I found out how much I needed, and then I went bargain hunting across online dealers to find the right RAM.
~Dave
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