I am planning to upgrade the standard 4gb of on my April 2010 Macbook Pro (the basic 2.4ghz model) to 6gb. Over on Crucial memory suppliers they advise using two identical modules, i.e. 2 4gb sticks rather than 1 2gb + 1 4gb. Can anyone chip in on whether this is good advise or just them trying to make a few more bucks? For my needs 6gb should be perfect, I have a desktop already with that amount, although to be fair the desktop is 3 * 2gb modules. Thanks.