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There is no possible upgrade path here, sorry ;-{
Intel never offered a pin compatible LGA775 socket i3, i5 or i7 series chip. The systems architecture is very different.
The only option which I think is going overboard here is to swap out the logic board with the iMac 27" 2.8 GHz i7 (Late 2009) logic board. Given the amount of work and price of a new logic board, I think you would be better off with a newer used system for the price.
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I found this same problem on an older post from IFIXIT, looks like they were asking about the same model. Here is the link to the problem, in the answer Mayer posted a link to a guide on how this can be done: iMac27 dual core 3.06 2309 CPU upgrade
Hope this helps
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If you purchased i5 or i7 logic board for the same model, you could upgrade the iMac to i series.
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Rundown of the different CPU's and there sockets:
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You have some errors here. I would recommend referencing this site:
- Intel Core i3 processor families
- Intel Core i5 processor families
- Intel Core i7 processor families
As a better reference
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