Since Eyefinity is part of the graphics driver, you must ensure you have the latest version of the AMD Radeon Graphics Drivers installed. Configure Multiple Displays to Run in AMD Eyefinity Mode
AMD Eyefinity Multi-Display Technology: Complete Guide & Setup amd eyefinity multi-display technology download
is a multi-monitor technology that allows you to combine multiple physical displays into one seamless "Single Large Surface" (SLS) . Whether you are a hardcore gamer looking for an ultra-wide immersive field of view or a professional needing a massive digital workspace for data-heavy tasks, Eyefinity removes the boundaries of individual monitors. Since Eyefinity is part of the graphics driver,
To use this feature, you do not download a standalone "Eyefinity app." Instead, it is a built-in feature of the AMD Software: Adrenalin Edition driver package. amd eyefinity multi-display technology download