Best Possible Cpu Upgrade With Board Change Imac Intel 27 Emc 2309 And 2374

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Current: Core 2 Duo (E7600) A1312 (EMC 2309) LGA 775 Socket T. Can I swap the board with any of the LGA 1156 Socket H boards?

You’re in luck! No need to replace the logic board only the CPU. This series is a transition series. Intel offered their first i5 & i7 series chips as direct drop-in’s: 27” iMac Processor Chip - 2.8GHz i7, Apple P/N 661-5428