Nvidia NVLink is not needed for SAFR because SAFR isolates all processing on single GPU for each feed. NVLink is only important for apps that have to spread a single process across multiple GPUs and memory needs to be transferred between GPUs.
If you see a large percentage of “Copy” activity on the GPU (using Windows Task manager), this indicates that data is being moved between GPUs. You should not see this with SAFR.
On Linux, SAFR uses a separate process for every feed; Whereas on Windows all feeds processed in Video Feeds window run as a Windows Service under a single process. NVLink is even less important under Linux since data sharing between GPUs should not occur.