Qnewbie

Don't underestimate the power consumption for OLD harddisk and PSU.
In my case, this two add at least 6~7W more to the total power consumption.
1. Old setting: 10G WD HDD, 300W PSU. Result: 27W.
2. Current setting: 4G CF card, embedded 12V power supply. Result: 16W.
It acts as asterisk server and firewall only.

Qnewbie

You are right.

ATA SHOULD be counted but no in my case. It should be SPA 3102 in the near future.