And because I know mac users have an unhealthy obsession with ram I thought i'd share. I just installed 16gb of this http://www.newegg.com/Product/Product.aspx?Item=N82E16820145281 And it works flawlessly. The stock 2x 2gb of ram that was in the imac is labled Elpida. A brand i've never heard of. Even apple will use no name brands to save money. Which is fine, ram is ram.