yeah power meters are pretty cool. i have a cheap-o Kill-A-Watt and the display updates only once a second, but the range of fluctuation is only a couple watts.
i'm drawing 2.75A from the wall. All my miners run on the 80+ gold-rated supplies. Looking it up, put in a 12% gain in efficiency and the system is drawing 290W total at the PS. System is:
- Intel Celeron G1830
- Biostar H81S2
- 5x PCI-e 16x-1x ribbon risers
- 5x Giga 750ti OC
- 1x Kingston HyperX 8GB DDR3
- 1x cheapo Sandisk Glide 16GB USB stick running kopiemtu
here's the Seasonic I use:
http://www.hardocp.com/article/2013/10/30/seasonic_gseries_g750_power_supply_review/4#.VVln4a3ImkAThis one's efficiency is pretty flat all the way up to full load.
The +125 MHz overclock in Linux gives me 6.0 MH/s right on the nose, for the Giga 750ti OC cards.