Hi there, I've just been given a brand new 2012 27" iMac and am curious as to wether its possible to install the extra memory I put in my old 2009 27" iMac? I understand the 2012 models use memory running at 1600Mhz whereas my late 2009 model used 1066Mhz, but cant seem to get find a definitive answer anywhere? Will it make any difference? Will I be able to use it but not get the performance? Will it not work at all? Thanks a lot!