hi all, sorry about posting about RAM, i know there are a million threads already... i just have some specific questions i was hoping to get answered. i have a macbook with 1gb ram, and i'd like to add another gig. questions: 1) i have 2x 512 DDR2 SDRAM, 667 mhz (according to system profiler). i suppose i have to buy 2x 1gb and get rid of/sell my 2x 512, right? 2) what kind of 3rd party ram will be good/compatible? i'm petrified of destroying my macbook. 3) i have applecare. will buying 3rd party ram and installing it void my warranty? what if i buy the ram, and bring it to an applecare shop to pop it in for me. does that NOT void the warranty? again, sorry for making yet another ram post, i'm pretty paranoid about this kind of thing so i really wanted to get some clear answers. thanks! jake.