I would like to have a 2560x1080 resolution

[Carlo]

Originally Posted by asdfsafd

@Carlo that would be awesome. Here are the two edid-Files from both of the attached monitors, zipped.

BTW: SwitchResX doesn't allow even a lower scaled resolution for 21:9.

Hi asdfsafd,

The monitor information says it's DVI. Given the resolution (the pixel clock is over 185MHz), it must be a dual-link DVI connection which is not supported by our products.
It should work with one of our USB-3 products with HDMI outputs. The good news is that it should work even without driver changes: with the monitor information we got from you the native resolution came up fine in OS X.

Hope this is helpful

Best regards,
Carlo