Just wait until the chip die shrink from 22nm to a smaller size, maybe 16nm. Then the power efficiency per hashrate will be have better yield then current ones.
When will this happen? Seems like we're stuck on 28nm for Scrypt miners.
I'm alittle confused on the 20nm chips. KNCMiner "did" or "did not" successfully release a bitcoin miner with these chips?
I'm seeing products from unknown companies out there for Bitcoin mining at supposedly 20nm -- but all of these products look like vaporware…
Also - from what I've read -- 16nm still has a ways to go in efficient yield or something like that?
I dunno - would love to hear from someone that is current with the chip manufacturing process.