EDID (Detailed Timing Definition)

I’m developing EDID for our custom display (aspect ratio 2:1) and noticed that all resolutions below 980x490 described in Detailed Timing Descriptor of any EDID (1.3 or 1.4) are not shown in nVidia Control Panel(Change Resolution section).
Timing generation is happening, the only problem is not shown in Control Panel.

Resolution 980x490 and higher are shown.