If 390x beats Titan X i will consider it, I already gave them money with the 290, only reason I sold it was because reference cooling.
I have a video of my one AMD card I own at this current time, my 5850 PCS+
Which does a damn good job being pretty on par with current gen console.
https://youtu.be/c-fCk8Reboc
I hope AMD astonish with HBM just like they did with GDDR5.