I wanted to test the new directx, and I have to say it increased my frames and overall experience a good 10-20% maybe even more. However during alt tabs when I alt tab back in I get the screen locks up. Some times during loading the game, it just locks up. I cant alt tab but I can still talk on team speak. other times it was worked for a while than just all of a sudden locks up and I donot get these issues back on my win 8.1 x64 os.