4k support is not a problem.

I tried GTX 970 on 4k - performance drop to 25% - 33%.

So yeah, whatever you feel good now - think about that. Are you willing to live with lower framerate or lower detail settings to get same framerate?

I wouldn't be bothered with 4K gaming because details are nice but they're not something you'll be observing in the heat of combat and whatever.

Perhaps you play DA:I or Skyrim and love to walk around exploring textures and details, yeah then go ahead.