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I can't imagine that such a relatively old game, requiring 512 MB RAM, wouldn't run smoothly with 3GB (ignoring other factors). I can imagine it would pause more fequently with too little memory to pre-fetch parts of a huge map (I don't know UT3, but I assume that doesn't apply), but I doubt it would cause (permanent?) freezes. Then again, it's easy to find out if a page file affects the game...