Just tried to do an upgrade using CRUCIAL MEMORY 2G DDR3-1066 UNBUFFERED NON-EC CT25664BC1067 204-PIN SODIMM. They told me it was guaranteed compatible. Sure sure. The unibody was intermittently crapping out waking from sleep. Seems like ram compatibility issues are still plaguing the new Macbook. Hey, maybe you have some Crucial and it's working, but there's plenty of people who have had it crap out the unibody. I'd avoid it. In fact, unless you really need the extra ram to run windows in virtual mode, I'd avoid the whole mess and stick with what ya got, unless you like hassles.