Macbook ram installation?

[oo5yolo10]

Ok i just got a macbook, and want to add some RAM but dont want to drop a lot of money. I heard some people use PC2-4200, it seems to be the cheapest.
1st question- Do i NEED to match RAM, not would it work better, but is it OK if i were to buy...lets say a 1gb stick and also have a 256, what would it really do to the computer
2nd- how do I open the macbook
3rd- Would a 512 boost do anything? going from 512 to 1gb?

Thanks for the help,
Luke

[WildCowboy]

0. While there are reports of 4200 RAM working in MacBooks, bumping up to 5300 doesn't cost much more, will run faster, and stands a better chance of playing nicely with your system.

1. Matching RAM is very strongly recommended for the MacBook and other systems that do not have a dedicated graphics card. I don't remember the numbers off the top of my head, but matching the RAM offers significant improvement for these types of machines.

2. See this PDF (http://manuals.info.apple.com/en/MacBook_13inch_Memory_DIY.pdf) for complete instructions on adding RAM to your MacBook.

3. A boost to 1 GB will definitely help and is probably what someone on a budget should shoot for unless you think you're likely to need a full 2 GB at some point.

[spriter]

Replacing the RAM is easy. Just remember to push the new SO-DIMMs in fairly hard. Apart from that, everything WildCowboy said :)