Question about RAM Upgrade for the late 2011 13'' MBP. I've read somewhere when upgrading it should match the same speed as the default one (1333Mhz)? Is it bad/won't work if you don't? For example, Is this any good? http://www.canadacomputers.com/product_info.php?cPath=24_309&item_id=041468 I heard Kingston is a better brand, but it's also more expensive (~20-30$ more). Is it really that much better? Or will the one I posted suffice? Lastly, is 8GB the max expandable? And I've read from the Guide that Windows 7 only uses like 3GB at most, is it still worth upgrading from the base 4GB? Thanks!!!