Please refer to the manual for the specifications. The general rule of thumb is

●     (Live) Streaming service uses a lot of bandwidth and CPU resources

●     Video Analytics service uses a lot of CPU/Memory resources

●     Admin or (Event) Monitoring services are moderately resource demanding

●     Recording services require high speed storages

●     PCs to run ISS Client software need to have a good VGA card, and CPU to decode multiple streams of IP video streams