The Antminer S9 can mine 4 terahashes on a single board while consuming 450 watts of wall power or slightly less.
The main advantage of this ASIC is that it's practically free, but its power consumption, noise, and minimal chances of finding a block in solo mining make it pointless.
Cheaper than the Avalon Q, it only requires a PC with a graphics card and remote control.
Ok so I find this to be quite confusing, what does S9 Asic miner has to do with graphics card installed on a PC motherboard? Or I don't get the point you are saying? I'm lost right here.
I think OP is more concerned about power consumption over hashrate, A Antminer S9 with 14TH takes 1250w even if there is a way to downclock it we are not going to get that 14TH with 300Watt running.
The NerdQ++ Rev6.1 takes 100 for 6TH and it cost the half of the price for S9, atleast in my own country, getting two of this NerdQ++ will do the magic, 12TH for 200Watts, this is one of the reasons why I like this small miners better, for anyone struggling with power consumption they can do mining with solo miners and keep adding one by one if one day they can handle higher power consumption.
I have a friend with over 12 over these NerdAxe and he is over 100TH on Bitcoin mining, the whole miner combined are less noisy than running a single Asic miner.