I have a AOC 2436vwh Monitor and was wondering why it works with 75 hz enabled at 1920x1080 but will display black lines at the top and bottum. it says in the spec sheet it supports 1440x900 at 75 hz and some lower resolutions but why those its a 16:10 , i dont get it. trying to make cs:go stop screen tearing on my 9800gtx+ -.-