Chosen Solution

These imac27 EMC 2309 and 2374 (Late 2009) are very similar; I wonder which parts are incompatible? I guess only the CPU, logic board and PSU?

They are twins! Lets look at the two systems for whats different

Only one thing! The CPU’s! This series was the transition between the Core2Duo to the newer Core 5 & Core7. Lets look at what is the performance differences between them Aluminum iMac Q&A - Published December 6, 2009 I would spend some time over at EveryMac - Lookup digging though what they have, and only the CPU’s are different.