Yes, the UD-3900 can support a single monitor up to 2560x1440 resolution at a 50Hz refresh rate.  The UD-3900 does NOT support 2560x1440 when two monitors are connected. 

Important Note: 2560x1440 resolution is only available when a single HDMI monitor is connected to the UD-3900.  2560x1440 resolution will operate at a 50Hz refresh rate; all lower resolutions support 60Hz refresh rate. The attached monitor must natively support 2560x1440 via HDMI input. 

Additional Note: If two monitors are connected to the UD-3900, then the maximum resolution of both monitors will be 1920x1200 at a 60Hz refresh rate