this might be old news to everyone here, but my gf is buying a new macbook and we came across this.

Confirmed! OWC brand 8GB RAM works in new MacBook
Friday, October 23rd, 2009 | Author: OWC Michael

We’re pleased to announce our findings that our OWC brand memory certainly takes the cake in these machines! While Apple lists 4GB as the maximum amount of installable memory, our 8GB memory kit OWC8566DDR3S8GP is now tested and fully certified for the full 8GB utilization – a real performance benefit for memory intensive application loads. While we were at it, we also tested another brand 8GB memory kit and found it consistently caused kernel panics and non-boot issues. Even though both are the same spec of DDR3 1066MHZ SO-DIMM, sometimes quality does have its result.

Thus, when we talk about how OWC brand memory meets or exceeds all Apple requirements for memory, it’s not just idle chatter or marketing-speak. Our on-premise testing lab enables us to physically confirm this fact for every machine listed in our compatibility charts. Then, we back our quality assurance with a lifetime warranty. How can you go wrong?