Although it’s been on shelves for a while, iFixit recently performed a teardown of the M3 iMac, and to no one’s surprise, the internal design and components are a lot like that of the M1 iMac it replaced. The one major change (besides the System on a Chip upgrade) is that the new iMac now uses a single Complementary Metal Oxide Semiconductor (CMOS) battery instead of the two that were in the older iMac. (A CMOS battery is used
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