If you are running at 1080p or the like in terms of resolution then sure, but if you are on a 1440x900 display like I am the 4890 is more than enough.
If you want the 4890 with DX11, get the 6790. That's what I saw it as. I say this because the 4890 is on the same level, in games, as the lesser 460 on the market.
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