Why do you want a refund for machine B3
bitcoin was obtained by CPU in the early days. With the continuous development of GPU speed and the emerging advantages of GPU general computing, miners graally began to use GPU instead of CPU for mining. Bitcoin mining uses SHA-256 hash operation, which will carry out a large number of 32-bit integer cyclic right shift operation. Interestingly, this algorithm operation can be implemented by a single hardware instruction in AMD GPU, while it needs three hardware instructions to simulate in NVIDIA GPU. This one alone brings an additional 1.7 times of computing efficiency advantage for AMD GPU. With this advantage, amd GPU is favored by the majority of miners
advise the landlord not to dig up if the budget is not too much!!! This money is not earned if you want to
the difficulty of bitcoin is increasing. Mining with graphics card is a race against time. The main reason is that the difficulty of mining bitcoin is graally increasing (the reason of bitcoin algorithm design). If a set of platforms can get 1 bitcoin per day according to the current difficulty, then in one month, the platforms with the same computing power will only get 0.8 bitcoins, even the top graphics cards will get 18.2 days (which can't be shut down), and the lowest second-hand hd7750 will need more than 400 (it will take 214 days to get one). Just look at this figure (this is the data in May this year, Now it's more than 18 days)
people can earn money by buying several mining machines (mining machines with dozens of top graphics cards piled together)
I hope I can help you
computing power of 5.6gh/s, the price of 3000 yuan "futures miner", so that you can back to the original in 30 days or so, and the cash miner back to the original time is about half a year, it can be seen that the temptation is full! However, in April, the author ordered "butterfly machine", the ancestor of "futures miner", on the US website. At that time, the book could be returned within 9 days, but now the goods have not been received, and the time of returning the book has become dozens of days
why? As more and more people join bitcoin, the difficulty of mining will increase and the income will decrease. Taking the equipment in my hand as an example, in early June, I can get 130 yuan of income from mining every day, but by the end of June, the income will be less than 50 yuan. Those futures mining machines are now back to the original time is 30 days, a few months later when you receive the goods... Think about it all feel terrible
therefore, returning to the original in 30 days is a cover up
the second trick: Celebrity investment / Tauren team
now there are many such futures mining machines in China, but they will play the banner of celebrity / Tauren to attract customers in the publicity. For example, in the early days, some people publicized that their technical team was composed of graate students from Tsinghua University / Chinese Academy of Sciences, in order to show that the mining machinery could be proced on time. Recently, the futures mining machinery company changed to claim that its partners included the founder of XX website, the former VP of XX website, and so on
but the problem is that no matter what kind of celebrity or coworker, they can't change the reality that the miner can't be delivered in a few months (the reason will be explained later)
barrier three: it is called
the real threshold of Miner: Avalon chip ordering
bitcoin miner is mainly composed of miner motherboard and Avalon chip. The former has long been published by Avalon miner's real inventor, Dr. pumpkin Zhang. Any electronic factory can download information and make it by itself. In addition, the overall cost of various electronic components is very low
the core Avalon chip is not so simple, it must be manufactured by a chip foundry such as TSMC. However, as Avalon chip is a kind of ASIC, unlike CPU and flash memory, it is a general-purpose chip, so the foundry must receive orders to start proction. This involves two thresholds: first, the order should start from 10000 pieces (the total price is about 5.6 million yuan), and second, it will take at least two or three months to deliver the goods after placing the order
this explains why the "futures miner" has to pay several months before delivery, and also explains why the "futures miner" manufacturers require you to pay in advance and do not allow a refund.
I recommend two: ant G2 graphics card miner, panda B3 plus graphics card miner
ant G2 graphics card miner is used to mark panda's B3 plus graphics card miner. In terms of computing power, they are almost the same. On the one hand, they use the vest card, and on the other hand, they use the rx470 without the vest, both at 220mh / s
take: Metro Line 5 (Tiantongyuan North Songjiazhuang)
go: Heping West Bridge (passing 8 stations)
go down: Chongwenmen (walking about 150 meters)
Change: 729 (Dongba building materials City chengheyuan community)
go up: Chongwenmen West (passing 22 stations)
go down: Wanyuan road
walk: to Beijing Aerospace general hospital, About 300 meters
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Qiaodong
Change: Express No.1 (Qianmen Demaozhuang)
upper: Muxiyuan bridge (after 9 stops)
lower: Donggaodi
walk: about 250 meters to Beijing Aerospace general hospital
bus route: no.809 → no.b3-b → no.328 Yiwu, the whole journey is about 73.8km
1. Take no.809 from the demonstration village, pass 36 stops, and reach the North Square (high speed railway station) station of Jinhua railway station
2. Take no.b3-b, pass 6 stops, and reach shangfo intersection station
3. Walk about 520m, and reach lihouzhang station
4. Take no.328 Yiwu, pass 8 stops, Reach Shangxi station
5, walk about 1.2km, and reach the black and white miner