4K monitors?

[Tom Horsley]

I see prices are getting better on 4K monitors (samsung has
one on sale for $599 at the moment), but I still find it
impossible to figure out if any given video card will
actually work with one :-(.

Is anyone using a 4K monitor on fedora with open source
video drivers and actually getting a 60HZ 3840x2160
image of a single desktop?

If so, care to share which video card and monitor
you use?