Mac service and repair. Learn about AppleCare+ and the Apple limited warranty coverage, start a service request for your Mac, and find out how to prepare your Mac for service. This is a Wiki post with information collected from the entire thread. Before you post, read this first. The difference between Mid 2011 21.5' and 27' concerning CPU upgradability is mainly caused by the available power from the power supply. The 21.5' has 210W power supply, the 27' has. Explore the world of Mac. Check out MacBook Pro, iMac Pro, MacBook Air, iMac, and more. Visit the Apple site to learn, buy, and get support.

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