When was the last time the graphics card dug up virtual currency

1.

at present, the computing power of bitcoin in the whole network has reached 2.36 billion hash collisions per second, which is equivalent to the number of water droplets in more than 200000 50 meter long standard swimming pools. But even with such a large amount of computing power, it will take about 10 minutes to hit a hash value that meets the requirements

in 2012, bitcoin's output was halved for the first time, and in July 2016, bitcoin's output was halved for the second time. At present, 12.5 bitcoins are awarded for recording one page of account book. The next halving will take place around 2020, and the total number of bitcoins will not increase by 2040, with a total of 21 million. In other words, the difficulty of digging bitcoin is increasing, while the time required is increasing

2.

Why use graphics card to mine

compared with CPU, GPU is used for general purpose calculation. So it can stack hundreds of stream processors awesome. Each stream processor is like a small CPU. Although its ability to run complex programs is far from the power of CPU, it can not support many processors, so the actual performance, especially the single precision floating point performance is much stronger than that of CPU. p> However, as we have mentioned before, a card is very suitable for general computing such as virtual currency because it has many stream processors, and the speed of obtaining specific solutions is much higher than that of N card. Therefore, many miners rush to buy a card to calculate virtual currency for profit

of course, with NVIDIA's Pascal graphics card, n card's ability in mining virtual currency is not as different as a card before. So in the current situation that a card is generally out of stock, those mid-range N cards have become the second choice for miners

What are the disadvantages of mine card

finally, I want to talk about why we can't choose mine card when we are shopping for second-hand cards. Because the miners are mining bitcoin, the most important thing is to seek profits. Therefore, the graphics card they use is running and calculating all the time, and its strength is far greater than that of daily game applications. In other words, running such a calculation for one day is equivalent to running a graphics card for one month

in addition, the places where virtual currency is mined are mostly the places where multiple graphics cards gather. Thousands of graphics cards are constantly calculating in a room, and their heat is also quite huge. Miners can not choose the chassis with good heat dissipation conditions like ordinary consumers, so that the heat can be released smoothly. In this way, the graphics cards can still operate for 7 * 24 hours under high temperature conditions, It also deepens its aging degree

the result of doing so is that the graphics cards used for mining are lost prematurely. If you buy these graphics cards, the result will be unstable operation, restart and other things will continue to happen

moreover, at present, manufacturers also have strict requirements on mine cards, such as banning second-hand sales and shortening the shelf life. If users buy these mine card graphics cards, future maintenance will also be a big challenge

3. There's a mistake upstairs. Bitcoin came out in 2009. How could bitcoin mining machine be 7 or 8 years old

now, of course, there are still people mining. There are about 21 million bitcoins in total. At present, there are about 13 million bitcoins in the world, and there are 8 million left. However, now mining is basically large-scale integrated mining machine, and the era of graphics card mining ended at the end of last year, because with more and more bitcoin being g out, the difficulty of mining is increasing automatically, and large-scale mining equipment is manufactured in batches, resulting in that the computing power of graphics card can no longer generate positive benefits
for example, the current mining difficulty is 16818461371, and the computing power of a better graphics card such as ati5970 is 800mhash / s. It takes 2863 years to dig out a bitcoin. The computing power of the large-scale integrated miner can reach 2tash / s, and it will take more than a year to dig out a bitcoin. There are many manufacturers procing this kind of large mining machine all over the world, and the computing power is still improving. Only this kind of equipment has been put into use for more than 100000.

4.

In recent weeks, the high-end GPUs of almost all major foreign retailers have been out of stock. The price of high-end graphics cards has been soaring, and the shortage does not seem to end soon. Behind the unprecedented shortage of GPU is the influx of miners who are engaged in the exploration boom of Ethereum, bitcoin and other cryptocurrencies. It is difficult for game players to obtain one card. NVIDIA even implements "two cards for single user"

the main culprit for the shortage of graphics cards is that high-end graphics cards are the best way to tap Ethernet and other non bitcoin cryptocurrencies. With the popularity of blockchain concept in recent weeks, the price of these cryptocurrencies has risen to an unprecedented height. A powerful graphics card can dig up a few dollars in cryptocurrency every day. Therefore, more and more amateur miners began to compete for graphics cards, resulting in the shortage and high price of graphics cards for other non currency people

not only there is no high-end graphics card to buy, but also the manufacturer has informed customers that the return policy of graphics card is suspended

5. It's a trade secret. How can you send it to the Internet casually? It's suggested that you go directly to the shopping mall to do field investigation, and then analyze the short-term data according to the investigation to infer the data of one year. Of course, you can go directly to the person in charge of the shopping mall to ask, but basically people won't tell you
I have done a similar paper assignment before, which is about audio-visual procts. I went to a lot of places to ask questions, but they either didn't want to answer or gave me very general data

6. Numerical type: integer and real type

1. Integer data (integer long)

both integer and long type values are integers. After users define a variable as an integer variable, they can only assign integers to the variable. Integers are faster than floating-point numbers and occupy less memory. Integer type values have a certain range, - 32768 ~ 32767, if beyond this range, we need to use long

2. Single double values

single and double values are floating-point values, which represent real numbers with decimals. Single precision can be accurate to seven bits, while double precision can be accurate to 15 bits. When users select these data types, they should pay attention to the value range of variables. And when the value is an integer, in order to speed up the operation, it is not necessary to define the variable as floating point. For large floating-point numbers, D, e format input and output can be used.

7. The essence of bitcoin is actually a special solution generated by a bunch of complex algorithms. A special solution is one of the infinite (in fact, bitcoin is finite) solutions that can be obtained from the equations. Every particular solution can solve the equation and is unique. The stream processor used by the graphics card is just suitable for such an algorithm. It's like constantly solving equations. The graphics card is 2000 middle school students, while the CPU is 8 math doctors. Although the mathematical knowledge of the doctor of mathematics is far more than that of the middle school students, the speed of solving medium-sized equations such as virtual currency is certainly not as fast as that of 2000 middle school students.