Sorry if this has been asked countless times but I looked through several threads & couldn't find the answer. I'm running a late 2013 iMac with an Nvidia 780m 4gb GPU. As a mobile variant it can't run Nvidia Surround. The iMac runs at 2560x1440 native and the 2 side monitors at 1920x1200.

Games such as the DCS series seem to run borderless windowed across the 3 displays no problem but running games such as Assetto Corsa (which has a run windowed option) etc with Borderless Windowed on a hotkey I have to physically resize the window to fit all 3 monitors every race. Can DF allow a game such as Assetto to open at a specified resolution (in my case dropping the iMac to 1920x1200 for a combined 5760x1200 res). Running all 3 borderless windowed would be great but I'll settle for bordered if thats all that I can get.

Hope someone can help as I'm doing my head in trying to find a solution and the free softwares have all failed. Cheers.

Hi yep I'm running Windows 8.1 via Bootcamp. I only game on the Windows side. OSX is only for work.