I just bought a refurbed macbook pro 15. 1.83 ghz and has 512 mb ram intel dual core. It looks brand new and I bought it from apple for $1299 so it is really too good of a deal to pass up since the ram is easily upgraded. My questions are, can I upgrade the processor speed or is it not worth it? As far as the ram goes, can I upgrade to the intel dual core 2. I want at least 1 gb of ram, but will I get a noticeable difference with 2 gb? I am only a student, but like to run a lot of programs at once. What is the best way for me to upgrade my ram? Just buy another 512 chip, buy a 1 gb chip (will it work as 1.5 gb?), or just go for the whole shot and buy a 2 gb set? And will it be better to upgrade to the intel dual core 2? Also where is the place to get the best prices on these? Thanks for your help, I am new to Macs but hope to learn more about them as time goes on.