By the way, out of the box, Windows 10 is better for gaming than Windows 7 out of the box and the Game Mode that is coming to Windows 10 is something that's also "needed" in Windows 7 since other applications in W7 can use a lot of resources, even if a different application (e.g. a game) is running in fullscreen.
I'd like to add that there are definitely some regressions in Windows 10 that make several games unplayable, while they run just fine on Windows 7 with the same hardware. I currently experience that with Borderlands, Hawken, and a few other UE3 and DX9 games. In addition, there's a 4GB virtual memory limit for the DX9 feature level runtime, so any game that uses DX9 and needs to allocate more than 4GB of virtual memory runs into that wall and displays really crappy performance.