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Hi, I have an iMac 27" late 2009 with Intel Core i5 2.66 GHz, and i’d like to upgrade to a i7 processor. I saw in the Teardown of this Mac that the Socket is the same, about a LGA 1156 Socket H. It should be compatible, so is it possible to upgrade? And when, which speed: 2.8, 2.93 or 3.06 GHz? Thanks

there is a guide for exactly this problem at (translated from french site macbidouille.com) Hardmac.com/27"upgrade

Yes. Guide is here - Upgrade iMac Intel Core i3 CPU to Core i7