for active PFC PSUs you don't need to switch the voltage, but you should check the manual first.
for a passive PFC one there may be a voltage switch on the PSU

i don't think this will come true in a short time. so LTC mining is much more FAIRER then BTC mining. everyone can get devices that are almost the same, i think finally the man who has FREE ELECTRICITY will win this competition.

about 1.66gh/s. one hd7970 contributes 660mh/s, two FPGA boards contribute about 500mh/s each.

i am now a university students and i live in school. our electricity price is very cheap, about 0.08USD/kwh. However, i did modification to the electricity meter and now i am using free electricity.

because i am a geek

BFL took our money to develope ASIC, then use the ASIC rigs to mine for itself.

he says he owned the rig

http://item.taobao.com/item.htm?spm=a230r.1.14.1.A07Zqo&id=20326699100