I got 2 monitors(1920x1080 & 1280x1024) and problem is when i run any 3d application (any indi game or heavy like BF3) in fullscreen mode i got bad video framerate on second monitor(any video source like movie in my WMP or Daum PotPlayer, or YouTube video). Issue only solves in case i turn off fullscreen mode in game. And i got none of this problems when i plug second monitor in my laptop with nvidia graphics. I tried to turn off all video options in CCC, disable\enable AMD AVT, browser hardware acceleretion, DXVA in potplayer but nothing changes. How can i fix that?
CPU: Intel DualCore e5700 3.70 Ghz
GPU: ASUS AMD Radeon HD 7770 1GB
RAM: 2x 4GB 1333mhz
Motherboard: ASUS P5G41T-M LX
HDD Seagate 1TB
Monitor: LG IPS235T (HDMI), Samsung SyncMaster (DVI)
OS: Windows 8