Hello, first time poster. I recently upgraded to 16GB of RAM on my Mid-2012 Macbook with OS Mavericks with this type of memory: http://www.newegg.ca/Product/Product.aspx?Item=N82E16820231704 I upgraded now, and I'm just running Chrome and maybe one or two applications at most like Word. When I check the memory it says I'm using 12GB of Memory, how is this possible, I had 4GB before, and at most I was using swapped memory of around 400mb when I was using 4GB. How it is I am using 12GB of memory? Apple "recommends" a maximum of 8GB, so if I did what Apple recommends (upgrade to just 8GB) I would be under by 4GB - and its not even like I'm running photoshop or anything. This isn't all the time, using 12 GB, most of the time I've checked periodically, and i'm using 8-10GB, when this happens, its mostly just chrome open or watching videos on VLC I don't recall ever using 8GB of memory when I had 4GB of memory.