for up to 1080p 2gb would be my choice. Over that i'd take the 4gb version. That being said though 20$ isn't much difference but some have said before that the 4gb version does run a tad slower as in the ram timings are probably a bit higher so if you don't ever plan in the near future to go to higher than 1920x1080 I would stick with the 2gig version.
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