I have a notebook pc with Intel i7-2670QM processor which is equipped with HD3000 graphics. The WEI score in windows 8.1 64 bit shows:
<Dx10SubScore>0</Dx10SubScore>
meaning the tests for DX10 are skipped completely by winsat.
I have the latest hd3000 drivers for windows 8.1 and, by looking at dxdiag, turns out that the drivers is WDDM1.2 and not WDDM1.3 as required by Windows 8.1.
So I must conclude these drivers are not using the DX10 functionality under Windows 8.1 64.
Intel drivers are:
Intel(R) HD Graphics 3000
Report Date: 2/3/2015
Report Time[hh:mm:ss]: 16:44:59
Driver Version: 9.17.10.3517
Operating System: Microsoft Windows 8.1 Pro(6.3.9600)
Default Language: Italian (Italy)
DirectX* Version: 11.0
Physical Memory: 3915 MB
Processor: Intel(R) Core(TM) i7-2670QM CPU @ 2.20GHz
Processor Speed: 2195 MHz
Vendor ID: 8086
Device ID: 0116
Device Revision: 09