Maximum possible external monitor size, for Field PG M4

Dear all,

I have a Field PG M4 (6ES7716-2DA11-0CB3) with CORE I7-3520M, Intel HD4000 graphics, Windows 7.

I would like to use an external display with this PG whenI am working in the office. The manual states that the DPP display port can output to a monitor with a resolution of 2560 x 1600.

Does anyone know if it is possible to run an additional monitor at 2560 x 1600 as an extended desktop, with the PG built in display at the maximum of 1920 x 1080?

I don't want to buy an expensive 2560 x 1600 monitor if it will not work with my PG.