AT 1280x1024, the picture looks great, and I cant see a difference. At that resolution, the picture is still at a 4:3 even though it is a 5:4 resolution. But everything looks fine. if it is the wrong ratio, then why would it be the optimal res, and better yet, why is it included here?
I called Dell, and they said that the picture at 1280x1024 should be 5:4 and there was something wrong with my monitor.
Somehow, I found that my monitor was able to do 100Hz at lower res than 12x10, so now I started to play games with that refresh. With Vsync off, the tearing seems a lot more noticeable and too distracting, so I need to have it on, if I play at that refresh rate. Response from mouse is insane. Like a boost of speed. 100Hz is very weird. I started playing at 10x7 now.