Answer to "Upgrading Logic Board with Core Duo to i5?"On the 13 inch, you can swap logics freely between 2009 and 2010 (both Core2Duo, but there are internal changes, bus speed, faster processors that make this an upgrade, and you can swap in a faster processor logic), but no others. You can swap freely between early and late 2011 (again for faster processors and Apple-undocumented design flaw revisions). The 2012 13”, at the least, has a different SATA cable than the previous years, and a couple of connections on the logic that are transposed but within the tolerances of the cables on the 2011; and I have not experimented with this swap out, self. On the 15”, you lose that freely swapping ability between 2009 and 2010 because the changes in board design to use the i5 vs the Core2Duo moved other things around on the board. When in doubt, you can lookup the board replacement instructions here for the different years and compare the pictures and notes.