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Recovering your Mac by a simple iMac boot disk Upgrading the memory of Mac books If you find your Mac book to respond slow or not being able to deliver the expected performance then your Mac book might need a memory upgrade. Take a look at your Mac book manual and you can easily find of what type of RAM is installed inside. The type of RAM usually depends on its year of manufacture, i.e. from late 2004 most companies started manufacturing DDR2 (2nd Generation Double Data Rate) RAM. Before, it was a DDR1 or a SD RAM (Synchronous Dynamic). Once you get to know the type of your RAM you have to know the memory speed of it. This also should be mentioned in your Mac Book manual. Generally the DDR2 SD RAM boosts memory speed over 200MHz, while a DDR1 SD RAM tops around 150-166MHz. Whichever it is, one point to be noted is that faster memory speed doesn’t employ your computer faster, but it is the amount of RAM that stays responsible. Experts mostly recommend installing the fastest memory speed of the RAM as it is easier for future upgrades and the system is more compatible with it. Going beyond the specified maximum memory speed is of no benefit at all.