I've done a fresh, formatted install of Windows10 Pro and reinstalled the drivers 2 times now. I get tons of hitching in games I play, and I can't seem to get rid of it.
It only started happening after I installed Windows 10. The moment before everything was fine. (I had Windows 7 before)
I've experienced this hitching in Natural Selection 2, Dota 2, Counter Strike: Global Offensive, World of Warships, pretty much every game I play.
CPU: AMD Phenom II x4 965
RAM: 8GB DDR3
Graphics Card: Radeon HD 6870 1GB
Driver Packaging Version: 15.20.1062.1002-150715a-187327C
Catalyst Version: 15.7.1
AMD Catalyst Control Center Version: 2015.0727.1507.25359