I actually didn't know that myself! I just had a look at the router for that machine:

This it does go up and down slightly but not much. Once in a while it barely spikes when it updates the price feed as well.

It certainly doesn't effect my internet speed or reach my monthly bandwidth limits.

I have some HP servers that I am getting ready to shutter and I wish that I could set one up as a node at some point

I'm sure you could. If you are using SSDs, I might recommend running a couple in RAID 0 to get the extra speed. Rishi was worried that SSDs are starting to not keep up. But I am not completely convinced of that theory. But since they are relatively cheap it wouldn't hurt to stripe them anyway.