Hi
I'm running Lord of the Rings Online, (they just went free to play) and having a blast.
I'm running it in DX11 with all most everything turned on, even anti aliasing and I'm seeing frames rates as high as 250 fps with a low around 150.
I have also run, Age of Conan, Dragon Age, Tomb Raider Underworld, The Witcher, and WOW on my new Windows 7 64 bit computer.
These games also ran fine on my old 32 bit computer when I converted it from XP to Windows 7 32 bit.
Mike