On my old Intel iMac I had my Samsung connected with a T3 to Displayport Adapter and it displayed 2560x1440 in 60Hz without problems.
Now I have the new M1 iMac and when I connect my Samsung SA850T I get only 1280x800 at 60Hz.
I tried in the T4 Port of the iMac and the T3 Port of my OWC Thunderbolt4 Dock.
Esult is always that I get only 1280x800. I then tried a USB-C to HDMI Adapter but that is worse because it gives just 1280x720 resolution.
It is the same Thunderbolt to Displayport Adapter that worked perfect on my Intel Mac so I ask WHY isnt it working on the M1 iMac now?
Forgot to mention - I have a 2nd Monitor, an old Dell that also has Displayport .
If I connect this to the iMac M1 it directly displays with its native 1650x1050 resolution directly.
So why this old Dell is working but the Samsung not?