In terms of BTC ROI, for someone with a limited amount of "free" power, is it worth it to replace my S1s with these? I'm basically paying 0.75 BTC for each unit to double my hashrate.
depends can you sell the s-1's ?
do you have 2, 4, 6, 8 s-1's ?
If I was running 3 or 4 s-1's I would buy 2 of these.
Since I am running 3 s-1's I purchased 2 of these.
I will figure out my power juggling once i get them. I have a place with the 3 it maxes at 800 watts at an 84% power discount. so the 15 cent power is discounted to under 3 cents. I can pull the 3 s-1's running now and put in two s-3's if they are not loud.
If they are loud I will run them in house at 15 cents a k watt.