I have had my stock Core 2 Duo 2.0 GHz white Macbook for a month now and I love it! I haven't looked back to Windows since. So, I now have three completely unrelated questions that I've wondered about for the past month. -- 1) Matching RAM brands I currently have 1 GB of RAM in my Mac and want to upgrade to 2 GB. However, I cannot afford to upgrade all at once, so I am planning on buying a 1 GB stick soon and the other at a later date when funds allow. I know the Macbook can only have the dual channel RAM speed advantage if both sticks are the same size and speed. But will it make a difference if they are of different brands? (The brand I buy now may not be the most affordable when I buy the second stick.) 2) Controlling Volume This is a general computer question that I've wondered for a long time, but what is the best way to control volume for sound quality? Is it better to leave my external speakers at a set volume and control using F4 and F5? Or is it better to set my computer volume first and control with my external speakers' knob? Or does it make absolutely no difference at all? 3) "Check Spelling As You Type" I love this feature in Safari, but it never stays on! Every time I activate it, it turns off when I move to a new field. Is there a way to keep it activated at all times by default?