Hey whatsup guys. I was wondering what i need to do to get a PC version of COD4 running on my iMac that i bought back in September 07. Right now I have 1gb of ram which i'm sure will need updrading to at least 2-4gb. Where do you guys go to buy ram that's cheap? Also, I'm assuming i'll need to upgrade my OS to OSX Leopard? other than that what would i need. Any help is much appreciated.