What is the difference in energy saving behavior between "My Cloud Mirror" and "My Cloud EX2"?

[Cybernut1]

Here’s some more info on WOL from a thread just coupledays old →   http://community.wd.com/t5/WD-My-Cloud-EX2/Shutdown-via-SSH/m-p/841223#M2314

No POE ports needed…WOL on my EX2 on plain gigabit ethernet port.