Hey everyone. I'm looking to upgrade my macbook's RAM to the highest gbs I can. I have two questions.... 1) I've seen lot's of stuff online about being able to upgrade my model to 6gb. Is that actually true or is it only 4? 2) Either way, what type of RAM do I need to buy? 1066MHz DDR3 SDRAM? My macbook specs are.... Macbook 4.1 (I think) 2.4 ghz 2gb of ram Model #: A1181 Thanks!!