Source According to the Khronos Group's Vulkan presentation slides from GDC, the restrictions on Windows OS users is down to the fact that for Nvidia SLI or AMD CrossFire the "WDDM must be in 'linked display adapter' mode." This is a mode only supported in the new Windows 10 WDDM 2.0, an exclusive to the OS. Thus it looks like Vulkan gamers using Windows 7 or 8.1 will be restricted to single GPU usage for the foreseeable future.
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