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If they are planing for 'full hd' games only I think 4gb is more than enough ...
currently I have 5gb ram (4gb system 1gb gpu) and its more than enough to play all games on full hd ...

even if the os is taking 1gb out of the 4gb there is still 3gb for system+gpu left (say 512-1024mb for gpu to have full hd) there is still 2-2.5gb system memory left for games which should be enough ...