Bitcoin doesn't use video cards (too many watts per megahash).
Bitcoin uses ASICs, for anyone who is serious. Like that
warehouse in Mongolia. This is why, if you're mining at home,
you get relatively nothing from the attempt. This warehouse has
most of the new coins cornered.
https://news.bitcoin.com/media-granted-access-to-bitmains-mongolian-bitcoin-mines/
It could be using the same rigs as this - Antminer D3.
It's made by the same company running that warehouse.
http://www.cbc.ca/news/business/bitcoin-mine-canada-1.4436149
https://shop.bitmain.com/productDetail.htm?pid=00020170718203947438V537cuy7067F
a) Hash rate: 15 GH/s (Variation of ±5% is expected)
b) Power consumption: 1200W (at the wall, with Bitmain’s APW3 PSU).
https://en.wikipedia.org/wiki/Bitmain
"They are a leading producer and designer of ASIC chips
which are used for bitcoin mining and Artificial Intelligence.
... sell to consumers under the "AntMiner" brand
"
Each cryptocurrency has its own "best" hardware
device. Video cards are only optimal for some of them.
I think that AntMiner might be more than 10000 times
better than a single video card. My guess is, there
are four ASICs inside the box, at 300W each, for a 1200W load.
https://en.bitcoin.it/wiki/Mining_hardware_comparison
I had to use
archive.org, to even find a table of values for
video cards. As I've been to that page before, back before
ASICs and FPGAs were in the table.
Ethereum will be switching from "regular mining" pretty soon.
And their algorithm uses a lot more memory for a blockchain
calculation. As a result, the AntMiner approach won't work,
as the Antminer would likely need terabytes of memory to
keep up. A video card with 8GB or 16GB of HBM2 RAM inside
would be a better fit for Ethereum. And there are lots
of other coin types (a few of which will be a scam).
Some of the lesser coin types have a sufficient cult following
to be worth mining. Some new startups, just invented to
accumulate "GoFundMe" style investing, not so much.
I don't think this stuff is going away... unfortunately.
Paul