Hello OneCD,
thank you. I hope so too, but I need to know it 
In case, there is a difference of 20 W each U at my Racks. 42 U = ~ 800 W.
And if I use WD 6W - 9W. Seagate 7W - 9W.
But I think you are right, the motherboard, CPU and so on: I hope it will not take 30 W itself.
I realy hope I can get a “better” technical spec.
operation mode in W
idle mode in W
Standby in W
Standby with wake on Lan W
VA
VA power supply itself
and so on
Its just for calculations and colocation costs. Thank you.