Ok, i´ve tried everything, changed the hz of the display and tried 2560x1440 -> Frequency not supported. It seems like that I could only downsample the resolution until 160Mhz, like 1920x1080 with 70hz. I use right now a Hdmi cable with a His dvi adapter, if I would buy this Dvi Dual Link could I put the resolution to 2560x1440 ? I read that a normal Dvi could do only 160Mhz (Pixel Clock) and a dual Link 330mhz. I want to use 2560x1440 with 60hz and this uses 241mhz.