How low can they be clocked from the firmware ?
Id like to know what the S7s consumption at the wall at its lowest setting.
100M is available hahaha
maybe u can try & tell us the results ?
power consuption is mostly linear if the chip voltage is unchanged. even at 100M you might be 0.25-0.27w/GH still (I personally know as low as 350M works on the dropdown list, no consumption numbers though)
looking at the numbers provided above, seems like at low frequencies its closer to 0.36w/GH @100Mhz (240w/670GH). server supplies likely have a 5-10% lower efficiency at <20% load, so a better psu (such as a 650W gold-ATX) might only draw 220W under the same conditions.
Consider that fans are ~5W+5W, and the controller board likely draws 5-10W extra, and the hashboard-level draw is closer to 200W, or 0.30W/GH