hey! I bought a white macbook 2.1GHz about 3 months ago, and after that time, i really need to upgrade my memory! I know that i can upgrade to 4Gb of memory, but i dont know if it will actually slow down my macbook, or if it will make it a little faster? I also went into a store the other day to see the prices, and i looked at the models...etc too. Now, can i put normal PC(laptop) memory on my macbook??? Basically, non-SODIMM memory. I want to buy 2x2GB of kingston memory, but it is not SODIMM.... Thanks if anyone can help me!!