Originally Posted by norcaljason
You can get a gtx 670 for ~$200. It's superior to both cards in every way. Return your 660 and shop around
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Actually, no. The 760 and 670 are extremely close in performance. They swap places depending on the situation.
Here is a review for you to look at. It will show you exactly what you are asking about.
My suggestion, is go for a second a second 660ti for $80 more than the amount of money you are looking to spend. The performance will be greater than anything else in the $300 range.
If you want to stay single card and in the $200 range, there are some used 680's in the marketplace ($250 asking) here which would be better than any of the other cards listed. As far as the 670 and 760, get whichever is the least. They are a tossup and will perform about the same in similar situation.