This message was posted on behalf of Intel Corporation
The missing driver seems to be the Software Guard Extensions driver. You can try with the following: https://downloadcenter.intel.com/download/25881/Intel-Management-Engine-Intel-ME-Software-for-Systems-Based-on-3rd-Generation-Intel-Processors-or-Above?product=80895
One more questions is what version of Windows do you have installed?
Nah, i had already tried that...you obviously tried the same google search as me.
That SGX driver
a. Doesn't work
b. is for desktop operating systems.
I've done a bit of further testing and have found that it is not the new CPU or the R revision board that adds the unknown device put the motherboard BIOS version.
So had a S1200SPL system board with BIOS S1200SP.86B.02.01.0055 using a v5 Xeon E3 CPU. Updated this same board to BIOS S1200SP.86B.03.01.0014 and the unknown device appeared in the device manager after the update.
So definitely the latest BIOS update is adding the unknown device.
Just turned off SGX in the BIOS....sorted