Okay, I've got two WhiteBooks, a late 2008 and a new 2.13. I'm selling the old one, which has 4GB of 667MHz of Kingston RAM. The new WhiteBook has 2GB of 800GHz stock RAM. What is better (Faster, more efficient), the 2 sticks of 800GHz? Or 1GB of 800GHz and 2GB of 667MHz?