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Introduction |
| Here are detailed instructions showing how to turn your iMac 4,1 into an iMac 5,1. I'm filling in some gaps in [http://www.tekrevue.com/stayin-alive-upgrading-cpu-hard-drive-ram-2006-imac/|this procedure for upgrading a 2006 iMac]. | | | I replaced the Core Duo T2600 CPU in my iMac4,1 with a Core 2 Duo T7600, which is the fastest replacement CPU for this iMac. I bought the replacement CPU on eBay for $25.89 from an overseas seller. The price was right but it took almost a month for the CPU to show up in my mailbox. | | | After replacing the CPU and updating the firmware, the resulting computer is equivalent to an iMac 5,1. It is now possible to install 4 GB of RAM, though the computer can only address 3 GB. | | | The best reason for upgrading the CPU is to be able to install MacOS X 10.7 Lion. This is surprisingly tricky to do. |
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