Hi HattiMax, I work with a Surfacebook and a Predator, both with an ex. Monitor 3840/2160 resolution at 60 Hz switched via ATen. Switching works well. The only thing I still have to complain about is that the monitor, mouse and keyboard are not saved. Unfortunately, this is not yet possible with any provider. (It was possible with HDMI&DVI with some providers).

Hi HattiMax, unfortunately I can't answer about the 3440 x 1440 resolution. I only have 2560 x 1440 and have no problems with it. I can't give any information about different resolutions either, because both PCs have the same resolutions. Sorry, you may have to contact the manufacturer.