Maximum Display Resolution DisplayPort* 2560 x 1600, HDMI*, VGA
2560x1440 or 2560x1600 via HDMI
Although the current HDMI standard (HDMI 1.4) actually supports displays with very high resolutions, you'll face display or graphics card problems. E.g., driver and hardware (single link HDMI) of the integrated Intel HD Graphics 3000 and 4000 restrict the resolution to 1920x1200 at 60 Hz and you'll need a trick to use higher resolutions.
The following article will briefly summarize our experiences and serve as a quick guide.