[Beowulf] OT: effective amount of data through gigabit ether?

[Mike]

I know this is off topic, but I've not found an answer anywhere.
On one IBM doc it says the effective throughput for 10Mb/s is
5.7GB/hour, 100Mb/s is 17.6GB/hour, but only lists TBD for 1000MB/s.
Does anyone know what this effective number is? This is for
calculating how long backups should take through my backup network.

(I'm not interested in how long it takes to read/write the disk,
just the network throughput.)

Mike