If you are running a P67 or Z68 chipset board and are tempted to give these new IRST drivers a try...... I'd warn against it. They do bring added functionality for those running Z77 or later chipsets, but they have been causing some issues for those running the older chipsets - especially if you have a RAID array.
I got adventurous this morning and thought I'd give the 11.6 drivers a try. It didn't work out too well. The driver wouldn't load at startup, and even if I booted into safe mode and force started the driver my array would fail. Thinking it was a bug that surely they worked out in version 11.7 I went about installing version 11.7...... needless to say that didn't work out too well either.
Fortunately I had an archive file of the IRST version 10.6 driver and I was able to install those over the top of the 11.7s.
Apparently I got lucky, because there are reports out (I researched after the fact ) that the new drivers have completely broken some RAID arrays resulting in having to break the array and start with a fresh installation of Windows.
And you cannot roll back to an earlier version of the driver using Device Manager.
Just a public service announcement
P67 or Z68 + RAID array = stay away from ISRT drivers 11.6 or 11.7