I guess you answered the thread creator? I have a FX-8320... I'm very lucky to pay only 30€ a month for power, as much as I want (okay if I would run a meth lab or a server farm than they would ask me...^^ But I use more, usually the others (in substitution) are using less, the men who is the "chief" of this project told me that for all ~35 places the electricity consumption at night is 70% for all people, (22-6, 10 p.m. to 6 a.m. I guess he means with "night", or until 8 a.m? But school starts at 8, stores open at 7... so I think 6 a.m.),
If I would need to pay the power my self I think I would buy a computer taking a larger amount of my "line of credit" and buy a intel CPU, since ~28.5 Cent per kWh in 2015 for Germany... I guess the FX-9000 series is better, but I think more expensive, so I did get the 8000 series, 220 Watt, needs a special power adapter I guess, since my 2010 computer (now the desktop pc of my mom) had a 500 Watt power adapter, this FX-8320/GTX 760 (as written above the special Asus version overclocked with more heatpipes and 2 coolers - maybe a bit more power consumption than the usual GTX 760) but for this system they used a 450 Watt power adapter... the i3-540 and HD 5770 for sure uses less energy than the FX-8320 system, you have to thing also about the HDD and the very small Kingston (a good company?!) SSD 120GB for Windows I use it and for Diablo 3 (I play only this game online, I do not play soo much anyway), for Diablo 3 because I did read SSD are like a accu, if the "clusters" (if it has clusters?!) will be destroyed after a number of writing... reading is no problem, but its SATA 3.0 and very very fast in reading at least I did read this, not for "my" SSD, but for SSD at all... and it does not get fragmented and defragment a SSD is only "damaging" it on long term...