512MB video versus 1GB

why id it that the 1920x1080 laptops have a 512MB ram video card? why can't i find a laptop w/ ddr3 memory, 1GB video, and a 7200rpm hard drive for $900 or so? is the 1920x1080 only good for video playback and not gaming cause i'd rather get my game on than watch HD movies!!
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  1. Best answer
    512 doesn't have a noticeable difference with 1GB in games
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