Presume we are running a full node under some version of Linux. Let's say 2 to 3 Ghz clock rate, 16 Gig of memory, and nothing running but the Bitcoin full node software.  About how much will the CPU be utilized?  Will it be fairly steady?  Or I suspect with significant peaks for each block that is validated and stored? 

I mostly use Windows, but, am quite certain that Linux is much better at this task.

If you are running a full node, please advise as to some of your system specifications.

After the full blockchain has been gathered and stored, what is the average and peak network bandwidth?

Thank you for your time and patience.