Here is your exact topic posted on a different forum. I really don't think there's much of a difference. Back in November the R9 had some driver issues, but I bet those are fixed by now. http://www.tomshardware.com/answers/...0-gtx-wow.html
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Toms hardware recommends the 760 also.
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Found some benchmarks. GTX is about 10 FPS better. http://www.techpowerup.com/reviews/AMD/R9_270X/23.html