Ok so my computer has some pretty good specs, i have 16GB ram and an AMD Raedon HD 6900 Series GFX Card. But still games like skyrim and Cod Ghosts lag on decent graphics settings. Worst of all, minecraft is lagging with about roughly 10-20 fps. I know Ghosts has been reported to run with lag but even my old computer (8GB ram + nVidia gtx 480 gfx card) ran it better then now. What is wrong with my computer?
Added (1). I have the Java SDK 7 Update 45 (64 Bit) Installed