The Dell U24214H has a minimal bezel width on 3 sides. Only the bottom is wide. To use these monitors in a dual portrait mode the default DELL setup is to allign the 2 top sides, therfor keeping bezel width minimal.
When creating an EyeFinity Group, it is NOT POSSIBLE to assign a different orientation to the individual monitors. ONLY 1 is used for both.
To make this work the left monitor should be in STD PORTRAIT mode and the right is in PORTRAIT FLIPPED mode. When NOT using EyeFinity this is not a problem as it is possible to assign different orientation modes.
Please make it possible to assign different orientation modes per monitor in EyeFinity Groups, so this feature can be used on these types of monitors.
I hope this will be possible in the near future.
Catalyst version used: 14.10.1006 (latest at this moment)