The latest update for driver that MS installed is dated 7/31 version 10.18.10.3262 in case someone wants to compare battery life and performance compared to latest Intel generic driver I just posted above.
Just edited to show correct version installed from 8.1, I rolled back then pressed search internet for latest update and it put me on 7/31 version. That's the MS latest one for our pro. I might compare the 2 to see how true what the engineer said holds.
With intel driver ..I felt massive performance increase in gaming when I go maximum power and all that.
But when I was watching 1080P youtube videos and I felt slight lag.