About the CPU, given the fact that the 2012 models do have the cpus with IHS, then I can upgrade them, right? for a moment I forgot that intel changed its socket to LGA2011, though they still make LGA1356. Do you think this cpu will work?
Yes you can, but not with that CPU, wrong socket. The socket for the 4,1 and 5,1 is LGA 1366.
http://en.wikipedia.org/wiki/LGA_1356
Lou