I see that barefeats has benched the X3100 graphics in the macbook at roughly twice as fast as GMA 950. (I suppose new drivers could change this.) I'm curious about other differences between X3100 and GMA 950. Does the macbook underclock the X3100 as it did with the GMA 950? Does the X3100 macbook support higher resolutions on external monitors? Enquiring minds want to know.