i have the same laptop just bought it for 500 its a apu the 6620 is not dedicated so theres no upgrading it, i think it a pretty good puter for the price, its cpu is also capable of 2.5ghz with its turbo boost and you can overclock higher than that
the good thing bout a apu is as time goes by and more faster ram is released upgrading the ram will help both the cpu and gpu in terms of running games at better fps
you would be able to run alot of games on good settings forget benchmarks go to you tube and see what others are doing with
http://www.youtube.com/watch?v=2TbXVTPuj8E

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