1210 watts quoted "at the wall" - an EVGA 1300 would have about 10% power reserve, even my favorite Seasonic X1250s have some power in reserve.
Indeed. Some of the more common official peak ratings are in my PSU guide, although for 24/7 its still going to officially be the stated rating. That being said, I've ran many corsair PSUs past their limits in challenging conditions and they've done fine.
Only if you can run each board on two instead of three connectors, contrary to bitmains instructions.
However, they said to use two connectors per board for S5 and some people used just one successfully (with a good quality connector such that found in EVGA).
Took the time to look closely at the pics available of the S7. It appears the connectors are all on a common power bus, therefore you should be able to get away with running each board on 2 connectors, at around 180 watts per connector (15 amps) at stock settings. LOTS more headroom on the connectors vs. running an S5 on a single connector per hash board.
I was guessing around $1300 and @6th
I was guessing 2.3+ TH at just under 4BTC. Actual machine is a little more than double the TH for a hair under double the BTC. If they'd gone 2 board vs. 3 and 2 strings per board vs. 3 looks like my estimate would have been pretty close, abet a little on the high side, for price.
I guess there's no way to include the halving in your calculation.
You'd have to do the calculation in 2 parts, one part pre-halfing one post - and take a guess at when it will occur (mid-July looks pretty likely at the moment).
IIRC the IRS regulations treat Bitcoin more as a security, not a manufactured item, but I've NOT gone through those regs with a fine-tooth comb yet.
MINING bitcoin can definitely be a business, but that's been obvious for a while now.
Same limits on "hobby" vs. "business" should apply as for any other business - if you expect to make a net profit (in 5 years IIRC) or support yourself on it,
you can call it a business.
The design on this miner seems to be tight. 3 boards are close, so I am not sure if any other fan would do the job
I suspect any LESSER fan won't keep the unit cool, unless you have a VERY cold room to put it in. Delta fans, especially the "directed flow" models as used on the S5, S5+, and S7, are very well known for being able to flow massive amounts of air despite significant back pressure - and the S7 like the S5+ WILL have significant back pressure due to the congestion caused by the heatsinks.
Not saying non-Delta fans can't work, there are a few other folks make similar capability fans, but I'd bet there is NO 25mm fan design that can flow enough air through an S7 to keep it cool at it's specified operating temp range, and very few 38mm ones.
I see people asking about coupons. Don't hold your breath. It's a new product and the first batch went quick.
Bitmain does not need to offer coupons until/if sales slow.
Bitmain specified that there would be coupons offered to late adopters of the S5, INCLUDING the used units, and the S5+, for purchace of the "next generation product".
0.60V 0.181W/GH (S7 / 18 Chip Chain with 10.8V supply)
But the fine print in the S7 page specifies to not drop the voltage below 12V.
It doesn't look like the S7 is designed to undervolt at all. 8-(
UnderCLOCK on the other hand, I'd suspect they can do.
I'm not sure, but I suspect A1 based gear is still profitable if you have 5 cent electric. Perhaps a little higher. Given how many Dragons were sold by Lketc, that's probably a pretty big chunk of hashpower.
