I just purchased a 4670k 7970 build and I have been hearing a lot of things about how Windows 8 gets like 30 frames more in games like BF4 than Windows 7. I want to know if I should return Windows 7 and get Windows 8 instead, will there still be a huge performance gap when the full game comes out? Also, will mantle support for the card in December affect whether or not I should get Windows 7 or 8? And why exactly does windows 8 get better performance than Windows 7? All responses appreciated, thanks.