I tried the Disciples 3 Demo a few days ago. Ran fine in 5248x1050 with Hor+ to what I've seen yet. There are some minor flaws, however: Main menu is Hor+ but some graphics end just after 1 screen. Loading screens are stretched or repeat themselves. Rendering scenes (Intro) are Vert+.
In case you don't know anything about the Disciples series: It is basically a "Heroes of Might&Magic" Clone, thus a RPG-RTS mixture with round-based open world map and round-based fights. The game's website can be found here: http://www.disciples3.ru/ (Make sure you click on the red "EN" on the right side for English website language).
The demo can be downloaded here: http://www.bigdownload.com/games/disciples-iii-renaissance/pc/disciples-3-renaissance-demo
Definitely going to buy this game, when I got through some other titles I have still laying around here :rockout