hello, I did a winsat formal. I already had dx10subscore = 0.
Guess what? Now I installed Windows 7 64 bit and the latest drivers for hd4000 from intel.
I ran winsat and here, under windows 7 the dx10subscore is 6.4.
Drivers in dxdiag (windows 7) are wddm 1.1. In Windows 8.1 were WDDM 1.3.
So, what is going on with Windows 8.1 drivers?
Now I will try 3dmark.