I was wondering if any of you have installed a 4GB and 1GB--the one it ships with--(Total 5GB) module in the late 2008 Pro yet? How well does it work? Does it improve speed at all? Is it worth the upgrade? Details/links/articles/videos/pics, are all greatly appreciated I heard it tales away dual-channel or something? Is this true? How much of a loss is this really? Thanks!