Finally, a remark to the Windows 8 users who claim "Win 8 is soo much faster than Win 7. It's well worth the install!" and then still place their games on an old HDD:
If you care so much about "faster" you would install all your games on an SSD.
I don't try to sound elitist, but my - in your eyes "slower" - Windows 7 installation combined with an SSD, will still feel faster while gaming, compared to your Windows 8 installation on an old HDD.
So claiming a certain OS will benefit you in games since it feels "faster", while you still use old HDD technology for your games, is silly.