hello all, I'm aware i may be grave digging BUT i believe I'm having incredibly similar issues as this thread (http://forum.osnn.net/showthread.php?t=88799). we are looking into getting my mobo/cpu replaced and will see if that alters my predicament. if it does not then i fear my videocard is indeed stuffed. i also have screen flickers and several programs just don't appear to be affected by vsync. anyways, this thread seems pretty good and is exactly what i experience. I came upon this thread by googling "core 2 duo optimizer" (without quotes) while searching for possible issues with core2 duo processors. i also have been looking at my power supply.