KB2670838 Windows Update Diminishes DX11 Performance For Windows 7 Users

I stumbled upon this while trying to investigate a loss of 2k points while benching, although it doesn't affect the benching program I was using, 3DMark Vantage, it does affect games and programs that use DX11. I did see significantly diminished performance in Batman: AC, DX11 enabled, before removing this update:

680 sli low score 3DMark

For reference:

http://forum.notebookreview.com/alie...t-2-a-389.html

Update number:

KB2670838