Howdy! I just purchased a 2007 intel core 2 duo 2.33ghz 15" MacBook Pro from my good friend! While I'm not new to the Mac world, use a Mac Mini daily, I am new to MBP and laptops in general. I did some searching or MRoogling as I saw on this board lol and found out a lot of stuff but I have a few questions about my particular model... So again my computer is a 2007 MBP 15" 2.33GHZ 120GB HDD 2GB RAM MRoogling I found that 3GB of RAM are my max but I see that 4GB is capable. I want to go CRUCIAL brand as I have that in my Mac Mini and works great. So my question if I upgrade to 3GB RAM should I purchase two sticks one 2GB the other 1GB OR just purchase one 2GB and keep one of the original sticks? I assume buying 2 new CRUCIAL makes more sense. 120GB HDD isn't enough! I'd love to upgrade to a 500 or 640GB asap. Here is my question - http://eshop.macsales.com/item/Seagate/YST9640320AS/ this kit should work on my model correct? From my MRoogling any 2.5" HDD should work if I'm correct but again I want to make sure! Anybody have experience with this kit? Side note: I love that I can use my old HDD as an external! That's mainly it for now! But reading thru these threads I'm confident that I'll get great responses seeing as most people on here seem to be genuine smart and nice people! Thanks!