I'm trying to keep my old 13" 2006 Core Duo (not Core 2 Duo) 2ghz Macbook a little longer. Have 3 questions. I'm currently running Snow Leopard. Can't upgrade to Lion right? Upgraded my Ram to 2gb a few years ago. Is this the max? Currently running a 320gb Seagate Momentus 7200rpm 16mb cache 3gb/s. Can I upgrade to the new Seagate Hybrid drive with 750gb 7200rpm 32mb cache 6gb/s sata?