Hello People I have an old iMac bought in 2007...can't afford to buy a new Mac so I gotta do what I can to keep using this and even though it's old, it has seldom failed me. I'm running Yosemite as I had to upgrade to run a program for uni (SPSS). It's getting a little old and can understand it gets slower but maybe I can save it. I was hoping to add more RAM and its running 2GB at the moment and it can only have a maximum, I believe of up to 4GB in 2 slots so...if I was to add more RAM I would need to buy 2x 2GB of RAMS and insert...that seems easy but is it going to be cheaper? Perhaps around $300 AUD. I can't afford to have it done for me but I'm clever enough to do it myself...Have done if for a PCs looooong time ago. That was where I was heading... Until someone told me to upgrade my CPU, which never crossed my mind. I'm not sure what's involved in upgrading the CPU and though I could learn, I think, it's still looks a little daunting. So can anyone please advise me which would be a better option for someone on a budget and also how easy is it to change the CPU. I would hate to stuff it up. Much Appreciated.