I was told by Nvidia support to come here and ask for help. I have three BenQ EX3203R’s that are native 1440p monitors being driven by a Nvidia RTX 3080. They detect as native 1440p monitors in Windows 10 with the latest WHQL driver but when I try to use Nvidia Surround, it calculates the three for a total of 11520x2160 instead of 7680x1440. The option to add a resolution is greyed out. I’ve used the Nvidia cleanup tool, latest drivers and to no avail as per Nvidia support’s direction. I have the three monitors connected via DisplayPort but have tried one of them with HDMI which made no difference as others have suggested via Google searches. When searching for this issue, there are other people with 3080’s and 3090’s that are affected. Hope you can help!
Here is a thread from other users on the nvidia forums: