That being said, I just wanted to point out that while Windows Vista could only support video drivers from one company running at a time on a given system, Windows 7 has the ability to run drivers for multiple brands of cards simultaneously. This ability was also (I think) introduced to Vista in Oct 2009 (via the Vista Platform Update). Basically, if your windows computer is running WDDM 1.0 (original vista), you can only run one video driver at a time, if you have WDDM 1.1 (Windows 7, and possibly updated Vista), you can run multiple.
No announcement yet.
Today, Delayed GPU Switching Comes To Linux