i want to upgrade my ram in my mid 2009 imac.(im pretty sure it holds up to 8) right now it has 4 and i want to upgrade to 8. with my old ram in my imac now i want to put in my mac mini that is only a couple weeks old. i want to know if all this is possible. also, if i open my mac mini to put ram in it will that void the 1 year warranty. thanks in advance to who ever can help me.