Many gamers have invested heavily in Eyefinity, and have been playing games in massive widescreen settings for some time. The majority of games available work well with the multi-monitor technology and, to-date, Eyefinity has been a good investment for anyone who can afford it. However, when it comes to Starcraft II, this has unfortunately not been the case.
The reason for the lack of Eyefinity support in Starcraft II is simple: Blizzard believes anyone with an extended view of the map has an unfair advantage and, as such, would have the upper hand in all online matches. However, there would still be some limiting factors, such as fog covering all areas not occupied by one or more of your forces.
The lack of Eyefintiy support is disappointing, to say the least. But, through a little digging, we've found a tool developed by a user at Widescreeengamingfourm.com, which will allows Starcraft II to be played across multiple monitors at any supported resolution.
The instructions from the developer, (HaYDeN), are below:
"Launch SC2 without the app running and pick a resolution the tool will detect and modify the resolution, eg launch SC2 and set it to full screen and the res to 1024x768, exit SC2, run the application, make sure the "When the resolution is set to" fields are set to 1024x768 and set "Rewrite with" to the resolution you would like it to set it to, relauch SC2 and it should launch with the settings you chose, it only works properly if full screen is set, you may need to alt-tab once or twice to get it to set it properly”.
Custom resolution launcher link - http://www.mediafire.com/?egmlh8xevsh2ri6
If you experience any issues opening the custom resolution launcher, downloading and installing NET Framework 4 should address it.
Using this tool, we've managed to play the game at resolutions of 5760x1080 and 5760x2160. Both worked to great effect, making a much larger area of the map viewable. Also, with a HD 5870, the game ran smoothly at the altered settings and there was not a time when the frame rate dipped below 30FPS.
This tweak does work, but is not supported by Blizzard, so Neoseeker does not take responsibility if your account is banned, or if any hardware or software issues occur. In other words, do this at your own risk.
The video below shows the resolution tool in action, alongside a partial replay of a recent online match.