elstel.org: The Thriving Hunt for 4K/UHD/2160p
Recent improvements of the Linux kernel make it possible: Enjoying a full 4K/UHD/2160p resolution of 3840×2160 pixels or more even with elder hardware. Many graphics cards which have never been advertised to feature 4K/UHD can be made to display such modes by overclocking your TMDS. While respective changes for the nouveau driver have already been assimilated into the kernel a separate hdmimhz patch is available for the radeon device driver.
