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I am currently using the iMac 27 late 2009. Old iMac 27 late 2009 Can I upgrade to i7 2.8Ghz A1312 on main board? Link to the CPU. https://www.ebay.de/itm/Apple-27-iMac-mi… Thank you Ahn
We don’t have a proper guide for taking the logic board out. We do have a Teardown iMac Intel 27" EMC 2309 and 2374 Teardown. Here’s a vid which gets into taking the board out Pwerbook Medic - iMac 27" Repair - Removing the Fan and Logic Board. You might want to snag this as well might be a good guide. Here’s a more detailed vid on installing the new CPU How to perform a iMac CPU upgrade As far as the CPU its self you’ll need the correct version Intel Core i7-860 Processor
