Avro Arrow :
The R9-280X easily beats the GTX 760 no matter how much VRAM is on board. The 3GB on the R9-280X (HD 7970) are far more than one monitor needs. Don't be fooled by marketing trickery like putting more VRAM on a board than it can actually use. Even in SLI, 4GB would be wasted.
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+1 280X all the way, and the Asus is among the best, that's the one I decided on and no regrets