I am having problems with a couple of games so far, I plan to test more games this week.
Game 1 is GTA V, for the first few minutes of playing the game stutters every 5 seconds or so. after that the game becomes smooth, comparable with windows 8.1 performance. Seems ok now.
Game 2 is Batman Arkham Origins, this game just runs horribly, flying around the city the game drops into the 30 and 40fps range, (physx off) then back up to 60fps, However the game runs fine with Crossfire turned off, with the fps droping to around 55fps when flying around. The game runs perfect in windows 8.1.
Game 3 Mortal Kombat Komplete edition, nasty flickering during gameplay.
Also i had the black screen before the log in screen, disabling ULPS in the registry worked for me.