Hi all, I recently bought a 21" iMac which was the basic bottom of the range one which offered 4GB of ram. Currently it looks like istatpro tells me I have 1.07GB "free". Not to moan about Lion, but things have got a little sluggish since I "upgraded" yesterday. So. My question is, will ordering 8GB of ram from crucial make any difference? I use my computer of editing photos, catching up with tv and email etc. I'm just not sure where 3GB of my ram went when I consider what I am doing is light usage - I literally just have safari and mail open. Also, if ordering extra ram is a good idea - does it matter that I would have 2 x 2GB from Apple, with 2 x 4GB from crucial? Someone once told me ram should always match? Thanks so much.