@bash64

You will have to see via Mac OS X. Check your boot rom version. Off hand I forget what revision my 2.7ghz logic board has, but its one that isnt offered online. 5.2.4f1 is the one shown on this 2.7ghz board. If yous shows that revision, you may be in luck on such an upgrade, but if yours shows to be older then that, I would say it can't be done because I tried upgrading the 2.0ghz board to some 2.7ghz CPUs but it didnt POST.

@_ThEcRoW

Just swapping CPUs. :)