I refer to this issue: High CPU usage with latest 3345 Graphic drivers update
I have exactly the same issue when the driver is installed. I was wondering why one Core uses all the time 100%.
So I did a fresh Installation of Windows 7 Professional 64bit and installed every driver by driver and checked again what's the cause of the issue. Result is, that the intel GPU Driver makes the issues.
Here some specs:
Mainboard: Gigabyte GA-H87-HD3
CPU: Intel 4570s
Atm im using the Windows Stock Drivers and do not have this issue.
I hope we can solve this issue together, since it's really annoying when one core runs at 100% 24/7. Don't you think?
Please do no let us stay in the rain as ATI usually does!
This is a known driver issue from Intel. Don't wait for an official downloadcenter release, these driver are usually outdated as hell. The current is 4 months old. Try this and report back: Station-Drivers - Intel HD & Iris Graphics Version 220.127.116.11.3412
It is unfortunate that Intel users are often forced to use OEM drivers but this is how Intel works, their release periods are not competitive compared to AMD and Nvidia. Sounds hard I know but this is reality.