is the i7 better or i5

[AnyOldName3]

The 7xxx series performs more or less as you'd expect on D3D9.

There are some games that are more or less unplayable with D3D9, and you'll have to use D3D11 or OpenGL for those. Some of them may also be broken in OpenGL too, forcing you to use D3D11.

No, no driver version has fixed the issue yet.

I think it's a little slower than D3D9 and D3D11 for all GPUs.