the R9 390X and Titan X come head to head with the 390X being slightly faster. In comparison to the GTX 980 Ti / cut down GM200 the gap widens in favor of the R9 390X.
What this means is nVidia is going to be forced to lower the price the Titan X below the 390X. People are expecting it to come in at $599. So much for a $1000 Titan X
edit: multiple sources are telling me that nVidia doesn't give a fuck and will probably price the Titan X at over $1000 anyways. I know my next card will be an AMD with HBM memory. nVidia can stick their ludicrous premiums where the sun don't shine
Read more at the source: http://wccftech.com/amd-r9-390x-nvidia-gtx-980ti-titanx-benchmarks/#ixzz3UTbJwXjN