Mining calculation power of radeon7
21.5 * 3600 seconds * 24 hours = 1857600 M / day
1857600 / 1024 / 1024 = 1.7715 T / day
a t of computing power / day can dig bitcoin worth 4.03 yuan
1.7715 * 4.03 = 7.14 yuan / day
since 2017, bitcoin has reached new heights. Yesterday (May 23), the value of bitcoin broke through the ￥ 16000 mark, hyping virtual currency, becoming a matter that the general public can participate in, And a little bit of technical level, both fried money, but also began to have the technical content of mining
as we all know, virtual currency has a numerical peak, the more difficult it is to dig. In fact, it's hard to judge whether to lose money or not if we continue to dig. Therefore, in the end how to dig, dig what can be the fastest back to this, this paper studies the above two core issues based on the current market situation
You can refer to the following, according to some commonly used graphics cards in the Internet bar market, sort out the price and calculation power of a related graphics card, as well as the expected return to the current period, It can be used as a reference:
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power consumption: 243w
computing power: 22.4m
price of graphics card: 1999 yuan
quantity of eth g every 24 hours: 0.015
revenue generated every 24 hours: 24.48 yuan
expected payback time: 81.66 days
power consumption: 159w
computing power: 24.3m
price of graphics card: 1599 yuan Yuan
number of eth g every 24 hours: 0.017
revenue generated every 24 hours: 27.9 yuan
estimated payback time: 57.31 days
total power consumption: 171w
computing power: 24.4m
price: 1999 yuan
number of eth g every 24 hours: 0.017
revenue generated every 24 hours: 27.87 yuan
estimated payback time: 71.73 days
Video card (graphics card) full name display interface card, also known as display adapter, is the most basic configuration of computer, one of the most important accessories. As an important part of the computer host, the graphics card is the equipment of digital to analog signal conversion, and it undertakes the task of output display graphics
the graphics card is connected to the main board of the computer, which converts the digital signal of the computer into an analog signal for the display. At the same time, the graphics card still has the ability of image processing, which can help the CPU work and improve the overall running speed. For those engaged in professional graphic design, graphics card is very important. Civil and military graphics chip suppliers mainly include amd (ultra micro semiconctor) and NVIDIA (NVIDIA). Today's TOP500 computer, including graphics card computing core. In scientific computing, graphics card is called display accelerator
for mining machines, the most important thing is the graphics card. Generally, you can choose the most basic motherboard that supports 6 graphics cards, and later you can choose the more complex motherboard that supports more than 12 graphics cards. The specific suggestions are as follows:
1. CPU - CPU can choose the most basic and cheap CPU, as long as you can bring the system up normally, Generally, you can choose Intel's g3900 CPU with a unit price of about 200 yuan< Operating system is too laggy. If you use 6 graphics cards, you need at least 4G of memory. If you are 12 graphics cards, the windows operating system needs at least 8g of the memory. Otherwise, the system will be very stuck and then can not work normally. The Linux operation system can be 4G memory. < br > />2.
3. Motherboard - it is recommended for novices to directly choose the special mining motherboard of Yingtai series. The models are tb250 BTC with 6 card slots and tb250 btcpro with 12 card slots, as well as H81 series motherboard of Huaqing
4. Hard disk - SSD hard disk is needed for hard disk, because the reading speed is fast, and virtual memory needs to be set. SSD hard disk can improve some performance theoretically. If you use Windows system, you need at least 64GB, and Linux system can use 16GB
5. Operating system for windows, it is recommended that win10 system, corresponding to NVIDIA series and AMD Series graphics cards, can recognize up to 8 cards respectively. If the motherboard of 12 cards needs N cards and a cards to be mixed, then we can make full use of the motherboard graphics card slot
6. Graphics card - the mainstream mining graphics card models are amd Series graphics cards rx470, rx570, rx580, NVIDIA Series graphics cards gtx1060, gtx1070 and so on. It is recommended to choose 4G or more memory, and 8g is the best.
The graphics card market in 2017 is the most special in recent years. In the past few years, no graphics card will increase its price by 100% a few months after its release. RX 580 has achieved this goal. Together with all the graphics cards below 3000 yuan, it has broken through the premium point in an irresistible manner. All this happened with the bitcoin price breaking through 3000 US dollars. After miners swept the RMB 2000 RX 580, the price of low-end RX 560 and even GTX 1050 Ti increased to varying degrees. However, is the price directly proportional to the ability of hash algorithm? Recently, we did a test to collect the new generation of graphics cards at various prices on the market, test the mining speed of Ethernet and bitcoin, and see which card has the highest cost performance
Different from the thousand yuan market, this wave of mining tide has a great impact on high-end graphics cards. In the test results, RX 580 and Rx 480 have almost reached the bottom of GTX 1070. Moreover, the price of Rx 580 is even competing with that of GTX 1070, so the miners directly swept the 3000 yuan market when GTX 1060 3gb / 6GB is out of stock, and GTX 1070 is basically out of stock. The more advanced GTX 1080 is also out of stock, but it's not clear whether the players are forced to go directly to the high-end card or the miners extend their claws to this market. The situation of GTX 1080 ti is only slightly improved, but it's not much better. However, not everyone can afford the 6000 yuan graphics card. Only the top players will be affected, but it's just a narrower choice. It's not the case that the rich can't buy itsummary:
to mine, the first choice is the graphics card with more than 3gb video memory, which is the basis. In addition, the core frequency will affect the mining speed. We have two GTX 1080 cards on hand, one is public version, and the other is MSI GTX 1080 gaming X. the operating frequencies of the two cards are 1885mhz and 1936mhz respectively. After testing, because of the frequency, the latter will be about 4% faster than the former in actual mining. The advantages of high-frequency graphics card are highlighted
So Xiaobian's opinions and suggestions are as follows:the low-end card and the old architecture card are not suitable for mining. GTX 1080 ti is an extreme, with the most powerful performance, but the price is not suitable for large-scale procurement. The mining speed of a card with the same location is much faster than that of N card, The cost performance of GTX 1060 3gb is higher than that of GTX 1060 6GB. The frequency and the number of stream processors / CUDA have a great influence on the performance of the card. The size of video memory has no influence on the mining. It's enough. Different video cards will have different profits if they dig different coins. If you want to further explore, you need to test several currencies, Limited to space, we only select two representative currencies to test
as long as the mine disaster does not occur, the shortage will last for a long time. However, if there is a mine disaster, a large number of second-hand mine cards will directly enter the market. These cards are always running at full load and full speed, and their service life is greatly shortened compared with that of ordinary users. Even if the price is lower, they will roll over at any time, There is no need to start at all. Moreover, the second-hand market will be directly disrupted. At that time, it will be difficult for some normal users to get out of the second-hand market, and the deep-water fish's Dragon killing knife will explode the galaxy. Now it is said that NVIDIA is making some graphics cards without display output interface, which are provided to miners as mine cards. With a certain capacity, if the mine card still can't satisfy the miners, won't the miners buy the graphics card in the consumer market? The only function of these special mine cards is to prevent mine cards from flowing into the second-hand market, which can not alleviate the current shortage of graphics cards
2. The content of the examination includes the following aspects:
maternal care: prenatal care, breast care, puerperal care, breastfeeding guidance, postpartum meal proction, postpartum gymnastics and psychological guidance
infant care: feeding the newborn, nursing the newborn's skin, nursing the newborn's facial features, bathing the newborn, disinfecting the newborn's umbilical cord, changing diapers and clothes for the newborn, guiding the newborn's sleep, etc
infant nutrition nursing: nutrition knowledge of newborn, method and time of adding complementary food, proction of complementary food of newborn, etc
3. After the examination, you wait to pass the examination of the labor department, and finally you can get the Yuesao certificate by issuing the certificate<
extended data:
examination ecation requirements
1. Junior high school or above ecation is required for junior high school nurseries
2. Junior high school or above ecation or five years of relevant experience is required for intermediate nurseries
3. A senior nursery teacher should have a bachelor's degree or two years' experience as an intermediate nursery teacher
application requirements
1. Love the work of Yuesao, have love, patience, responsibility and good health
2. The age of urban and rural registered women with ID card is about 20-50 years old
3. Bring the original ID card, one and two one inch ID photos when signing up;
Yes , on August 21, Beijing time, recently, TSMC officially announced that the 7Nm chips, which were put into large-scale proction in 2018, have now proced more than 1 billion 7Nm chips. At the same time, more than 100 procts began to use the 7Nm chips proced by TSMC
it is understood that TSMC's first 7Nm chip started large-scale proction in April 2018. Meanwhile, the billionth 7Nm chip was proced in July this year. In these 27 months, TSMC has to proce more than 37 million 7Nm chips every month
according to the data, the first batch of TSMC 7Nm procts include bitmainland's miner chips, Xilinx's FPGA chips, apple A12, Huawei's Kirin 980, etc
extended information:
Introction to Taiwan integrated circuit manufacturing Co., Ltd.
Taiwan integrated circuit manufacturing Co., Ltd., Chinese abbreviation: TSMC, English abbreviation: TSMC, belongs to semiconctor manufacturing company. Founded in 1987, it is the world's first professional integrated circuit manufacturing service (wafer foundry) enterprise. Its headquarters and main factories are located in the Science Park of Hsinchu City, Taiwan Province, China
in 2017, the market share was 56%. In the first quarter of 2018, the combined revenue was US $8.5 billion, a year-on-year increase of 6%, the net profit was US $3 billion, a year-on-year increase of 2.5%, the gross profit rate was 50.3%, and the net profit rate was 36.2%, of which the 10 nanometer wafer shipment accounted for 19% of the total wafer revenue. As of April 19, 2018, TSM has a market value of US $217.4 billion and a static P / E ratio of 19
on July 16, 2020, at the TSMC's second quarter performance presentation meeting, the spokesperson disclosed at the meeting that he did not plan to continue to supply goods for Huawei Technology Co., Ltd. after September 14. The new regulations on Huawei announced by the US government on May 15 will take effect on September 15. On July 13, 2020, Taiwan media juheng.com reported that TSMC had submitted an opinion to the US government, hoping to continue to supply Huawei after the 120 day grace period of Huawei's ban expired
Wireless cable bus, I read the article to share with you
the first part, communication control strategy selection
at present, smart home, as a popular branch of the Internet of things, has begun to walk into the families of ordinary people. As an ordinary user who has only just contacted or not contacted deeply, how to use it in all kinds of crazy smart home advertising, It is a headache to choose the appropriate smart home solution in the smart home life scenes rendered by various large companies
the current common communication technology solutions can be classified into wired solutions (transmitting control signals through wired media) and wireless solutions (transmitting wireless signals through radio waves) in terms of realizing control communication technology solutions
common wired control schemes are divided into RS485 bus, can bus, KNX bus, IO direct control (signal transmission through the on-off of the line nodes))
common wireless control schemes are divided into medium and short distance ZGB, zwave, 315 / 433 / 2.4G, non networking bidirectional, 315 / 433ask, WiFi, long distance Lora, Nbiot (with communication charge))
reliability analysis of two classification schemes
wired & gt; Wireless
because the wired signal transmission is through the physical medium, the vibration of the voltage changes to transmit information, in the case of line wiring specification, the external interference is very small, in the direction of reliability, the wireless is subject to the transmission distance, electromagnetic environment within the transmission range, communication network delay and other factors, there is the situation that the control information can not be transmitted to the controlled equipment. The most intuitive example is that people use the landline to call the landline, the voice is very clear, but when they use the mobile phone to call the mobile phone, or when the landline calls the mobile phone, sometimes the communication is intermittent. So wired is more reliable than wireless
in wired control scheme: IO direct control & gt; Bus
IO direct control is directly input to the control system or embedded MCU through on-off signal, without any data molation, conversion, on is on, off is off, MCU can get on-off signal very clearly and clearly, so as to make executive response, almost no delay occurs in real time
all kinds of bus communication is to transform the information to be transferred into standard bus level signal through special communication protocol chip, and transfer the information through a certain frequency of level signal vibration. There are two links in the middle: information program processing conversion and level conversion. The two methods have their own advantages and disadvantages. In the existing wired control schemes, the two methods are generally combined. IO direct control is stable and reliable, but the transmitted command data is wired, and the two lines can only transmit 0 / 1. People can understand the telegram. The bus is stable and reliable, but the two lines can transmit all kinds of control commands, which can be understood as a telephone line that can transmit any information
in the wireless control scheme: nbiot & gt; Lora > wifi > zgb/ zwave > 315 / 433 / 2.4G non networking bidirectional & gt; 315 / 433ask
nbiot is based on the mobile network of operators. In theory, it can be connected and controlled where there is a signal. However, e to the high price of the mole and the need to pay for the communication expenses of operators, it can not be widely used with families, but in bike sharing, smart meter, smart charging pile... It is widely used in many scattered commercial projects
Lora is also a very hot wireless communication technology recently, which combines the advantages of two-way communication, strong wireless anti-interference ability, automatic frequency molation to avoid congestion, long communication distance, and communication after power on. It is sure that there will be more and more applications in smart home in the future, and the development at this stage is also constrained by the expensive mole cost and large volume, Network encryption communication system is not perfect and other factors have not been applied on a large scale
With the participation of major chip manufacturers, WiFi is now very cheap and can be called cheap. It took less than two years from tens of yuan to a few yuan now, and it has been widely used in all kinds of intelligent procts. However, e to routing networking, network delay and other reasons, large-scale application in big house still has its limitations. For example, after power failure and incoming call, it needs to wait for its connection network to be controlled, and a scenario execution may be inconsistentZGB / zwave, as an old short-range ad hoc network wireless communication protocol, is very popular in the wireless communication scheme a few years ago. Now it has been graally marginalized e to the impact of WiFi. From the perspective of the people who designed this set of communication rules at that time, ad hoc network is a very good way and far sighted, but short-range restricts its development, It is a great experience for network deployment. You should at least have a standby node within its communication range. Otherwise, once the key node fails, the control equipment through the key node will be out of control. At the same time, because the network needs time, it can not be powered on immediately. Suitable for small house control, once the house is large, the delay will be very obvious
315 / 433 / 2.4G non networking two-way, this is equivalent to that the major manufacturers are free to play more, there is no unified standard and protocol, point-to-point, point to many, or many to many all depend on the manufacturer's background settings matching, because there is no standard networking rules protocol, the stability and reliability of this depends on the manufacturer's basic skills. Short communication distance is not suitable for large house applications
315 / 433ask, which mainly transmits 2262 and 1527 coded wireless signals, is a widely used short-range wireless communication protocol in the world, without the feeling of networking, with direct signal, simple control, mature moles and controllable cost, and is widely used in large-scale applications. There are thousands of moles on Taobao that can be freely combined and expanded very flexibly, The disadvantage is that there is no feedback
If you have a big house, you can choose wired controlif the house is too small and the real-time control reliability is not required, the wireless scheme can be selected
personally, as far as home control is concerned, after all, these are high-frequency devices. In the early stage of the wired scheme, there is one more link in the wiring, but in the later stage, it will be very easy to recommend the scheme with wired as the main part and wireless as the auxiliary part. If there is any omission in the wiring, use wireless to make up for it
the second part, networking control strategy selection
smart home as an important part of the Internet of things, networking control has been used as a basic standard control mode. Now you should be surrounded by all kinds of cloud controlled advertising. Have you heard about all kinds of big data and intelligent AI marketing? Do you think these concepts are high-end and avant-garde
what is cloud control and big data
to put it simply, when does your wife go home, when does your child go home, whether the gas valve is on, and whether the sensor detects that you have been to the bathroom several times, and whether there is anyone at home now... The information is first transmitted to the business server through the smart device at home, and then your mobile phone connects to the business server through the account and password. The business server pushes the relevant data to you, so that you know the status of your home. You can control and operate the equipment at home through your mobile phone, and control the smart device at home through the business server, This is cloud control. Mobile & lt-& gt; Merchant server & lt-& gt; Smart devices at home
the control data of eating and drinking Lhasa is big data
According to statistics, you go to the toilet at 7 o'clock every day for several months. AI may think that you go to the toilet at 7 o'clock every day, and then suddenly turn on the toilet light automatically at 7 o'clock every day. However, you want to sleep in today.... This is AIfrom the perspective of open Internet of things cloud platform providers:
now there are many free logistics network cloud platforms, the ecology of Xiaomi, the ecology of Jingdong, the ecology of Ali.... Everyone's idea is to let smart home or home appliance manufacturers hang up all the devices and realize the management and control of all the devices in the cloud. Now many basic services are free, just like Taobao was free at the beginning, but the follow-up is not clear. This is a very smart profit model for cloud businesses. They don't need to spend a lot of energy to develop a variety of hardware devices. They only need software platforms to integrate various hardware resources to create wealth. At the same time, they can extract greater business value through big data analysis of various data uploaded by various devices and user usage habits
from the perspective of smart home or home appliance manufacturers:
I don't have the energy or technology to build a cloud platform. If I have a free one, it's just easy. I can also advertise my own cloud. I feel it's advanced if I have a cloud. At the same time, it can collect user data, which can help you get more at one stroke
I don't know if you've noticed that there is a user's perspective missing in this link. The above two interest groups regard the users or the devices purchased by users and, more specifically, the various data generated by the devices purchased by users as a resource to provide services for big data analysis or larger layout. At the expense of the user's ego, the platform business's ego is achieved
from the user's point of view:
1, am I willing to hand over all kinds of devices in my home to the platform provider for management? After choosing the platform, you don't have to choose. Open your mobile control app and see the privacy agreement that the manufacturer has prepared for you. You can choose not to use it. I will collect your data when I use it
2, do all the devices at home feel safe in the cloud? It doesn't matter when there are only one or two sockets in your home, but when all the household appliances, detectors, power data and video data in your home are in the cloud, even if they are very safe, there is no sense of security
3, what if the platform provider's service is down and the device is hacked? When all the devices are regularly connected to the platform, the data of these laws can be analyzed in the background of the platform, which is more attractive to hackers or people with bad intentions. Think about making millions of families turn off the TV and water valves at the same time, and the sensational effect and influence can definitely make the headlines
4, I just want to know my data, OK? Now all kinds of channels and software are full of means of user data collection. Choosing cloud is equivalent to uploading all the data of your family's operation status. Both platform providers and other businesses will guarantee not to disclose user data, and will say that customers are the first, but the data will certainly be used by platform providers or businesses for analysis. It depends on how you feel
as an ordinary user's basic needs:
1, can safely control their own home equipment
2, I don't want to upload or leak my control data to ensure my privacy
is there a good plan for you to choose
as a technology enthusiast, the answer is yes! Dynamic domain name port forwarding
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