[blattimwind]

TDP is largely irrelevant. You are interested in either energy per task or power for availability, neither of which you can figure out from a datasheet. The latter is essentially the same as idle power, but depends on what services you run.

[jleahy]

Sounds like vbezhenar cares about being woken up at night by a noisy server, in that case maximum power draw regardless of load is what matters.

[blattimwind]

Why do you expect high load at night?

[MrGilbert]

Backups come to mind. For me, I schedule them at night.

[thedance]

Have a look at the crontabs that ship with Ubuntu.