The first three generations of Intel-based iMacs use the same Socket M to mount the CPU and have a 667 MHz system bus. The CPU is not soldered in place, allowing the Early 2006, Mid 2006, and Late 2006 iMacs to take the same CPU upgrades, bringing speeds as high as 2.33 GHz.
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We believe in the long term value of Apple hardware. You should be able to use your Apple gear as long as it helps you remain productive and meets your needs, upgrading only as necessary. We want to help maximize the life of your Apple gear.