H.264 8Kx1K encoding with NvEncoder

I would like to know whether NvEncoder can encode 7680x1080 resolution YUV4:2:0 file as H.264 with Quadro K2200 or not.
I would like to use the information as a reference when I make the purchase.

Thank you and regards.

Please use the GPU Support Matrix to look up your GPU.
You can see that the Quadro K2200 is a first generation Maxwell [GM107] GPU with 1 encoder. You can also verify that it supports YUV 4:2:0 H.264 https://developer.nvidia.com/video-encode-decode-gpu-support-matrix

Once you know the GPU family you can verify the max resolution in the features table.https://developer.nvidia.com/nvidia-video-codec-sdk#NVENCFeatures

From that table you can see that Maxwell 1st Gen supports a max resolution of 4096 x 4096. Which means that the hardware is limited to a maximum horizontal resolution of 4096 which means it will not be able to support your horizontal resolution of 7680.

To encode at 7680 horizontal resolution you will need a Pascal GPU and would have to consider HEVC encoding.