How feasibile is it to run a newer version of OSX on a used Mac? Thinking of buying a used Apple MacBook and wanted to know the best way to tell based on the hardware specs provided by Apple online by entering in the serial number for the MacBook here:


http://support.apple.com/specs/


After pulling up the specs for the hardware on Apple, how do I figure out what the feasibility of running a newer version of OS X on that used Mac is?
As long as it is a Core 2 Duo processor or better (read: 64-bit architecture), you can put Lion on it. The sole exception seems to be early 2006 model with an Intel Core Duo (32-bit); this one will only support Snow Leopard.

Reference: http://en.wikipedia.org/wiki/MacBook