Your "projection" was based on Hashfast pricing. Still $50 or $100 or $250 per TH/s is just as utterly silly for any vendor, any design, anywhere in the world.
I used hashfast to guestimate electricity efficiency and asic costs in general, based on their figures as at that time they were the only 28nm ones with stated die size. And you've seen the thread where I pulled that chart from, I never even made an attempt to price in the rest of the hardware, I based it solely on the chips and left it up to anyone who wanted to fill out their own assumptions for the non electricity non asic parts for reasons I also explained there. I also never set out to prove 650PH in a year, I didnt come up with that number, and I most certainly didnt come up with that timeline.
But hey, since Im to blame, lets see if we can defend it. Instead of using hashfast, lets substitute it with the Coincraft A1 specs at nominal mode (low power mode might be better, but I cant find a hashrate for it). And lets use some more realistic total system costs and expand the ROI horizon to 2 years. What do we get then?
