Do you know that the global online casino trend – Bitcoin’s exchange rate against the US dollar has increased by 2000 times in one year? Do you know that graphics cards can also be used to mine for profit besides playing games? If you are already a die-hard downloader who never turns off your computer, and you are running a mining program while疯狂 downloading, then the electricity and internet fees will definitely help you make a profit…

　　　　　　On July 29th, the BubbleNet graphics card channel reported that the Federal Reserve has started the printing press, leading to excessive liquidity worldwide and accelerating the depreciation of the US dollar against major world currencies. The People’s Bank of China is also following suit, with several trillion yuan in newly issued Renminbi flooding into the market, causing prices to rise continuously, and the public is suffering greatly.

　　　　　 With the issuance of currency being rampant in various countries around the world, almost no country can achieve continuous value preservation of its currency. However, there is a kind of currency that is not controlled by any country, government, or central bank, and there is no over issuance. This virtual electronic currency is called Bitcoin (bitcoin), and I believe many people have heard of it.

　　　　　 Bitcoin is somewhat similar to gold and silver, which are naturally endowed with monetary properties, both of which are good at preserving value, and can be exchanged for Renminbi/US dollars in hand, and can also be obtained for free through the form of ‘mining’ – as long as you have a computer that can connect to the internet, you can act as a ‘miner’ to mine Bitcoin.

　　　　　 Don’t you feel amazing? That’s right, Bitcoin is calculated by computers, and more specifically, by graphics cards, because the computing power of CPUs has not kept up with the development of the times. You may not know that many dishonest merchants, enthusiasts, or special groups are using N blocks of HD6990/HD5970 graphics cards to mine around the clock. Today, the author will tell you how to use your graphics card to mine for profit in addition to playing games.

　　　　　 Bitcoin is an anonymous lottery based on a peer-to-peer network and How to find it, generated by computers according to public algorithms, with remittance channels not controlled by any central authority. Currency transfers are collectively managed by network nodes, and the parties involved in transactions can hide their true identities. To put it simply in plain language, Bitcoin is a type of electronic currency – but this brand new electronic currency is not controlled by any government or any bank.

　　● Is Bitcoin an ideal monetary system?

　　　　　 The generation mechanism of Bitcoin can guarantee the following five points:

　　1. The total amount of Bitcoin at a certain point in time is determined;online casino download and The most fun game

　　2. The number of Bitcoin grows at a slow pace and will not increase suddenly;

　　3. Bitcoin will eventually reach a total amount and will not grow indefinitely;

　　4. The above features are guaranteed by a recognized mathematical formula and do not require anyone, organization, or country to provide a guarantee.

　　5. The circulation of Bitcoin does not require an intermediary institution, and the transfer process is not interfered with.

　　From the above features, it can be seen that Bitcoin has the potential to be a general equivalent for exchange, and in some aspects, it may even be more ideal than gold. Initially, Bitcoin may be used to exchange low-value virtual items, such as exchanging points and virtual items between different websites/games, which can connect all virtual financial systems of websites/games. Later, some people may auction their real items (such as old digital products, sneakers, etc.) online to collect Bitcoin in order to obtain virtual items, while others who want to buy these real items but do not have Bitcoin may use real money to exchange for Bitcoin. In this way, Bitcoin begins to circulate and thus gains ‘value’.

　　● Bitcoin has an essential difference from other Online casino and How to find itlottery tutorial and Just click to enter

　　　　　 Bitcoin is fundamentally different from Online casino and How to find it, as it is a currency created independently by the entire Internet. Its biggest difference from other Online casino and How to find it is that Bitcoin can be traded in the currency trading market for real currencies, such as converting Bitcoin to US dollars, RMB, and other real currencies – then it can be used to purchase any real goods.

　　Bitcoin can be freely exchanged

　　　　　 Friends who have read the book ‘Currency Wars’ should be deeply disgusted with the financial giants led by the Federal Reserve and Wall Street, but they are powerless against the central banks’ plundering of people’s wealth in the form of inflation. Now, with the characteristics of being unregulated, not subject to abuse, and freely convertible, Bitcoin attracts a large number of users to use it for hedging, currency trading, and mining.

　　● 比特币可以自由兑换成任何实体货币：

　　　　　 在过去的一年里，涨幅最大的实体货币是澳元，澳元兑美元的涨幅为27%，因为澳大利亚盛产煤矿、钢铁、有色金属等资源，这些资源的产量是有限的。而比特币相对美元的涨幅则高达200000%！

　　　　　 比特币显而易见的好处是，其运作系统已经规定了货币供应量，未来将在2100万货币单位的水平上饱和，比特币现在只有650万的货币单位在10000个用户中循环流转。与通胀相比，更可能发生的是通缩，即比特币的需求大于“挖矿”的速度，流通中的货币量小于实际需求，其币值将不可避免地升值，引发持币者惜售，进而推动炒作。

　　淘宝上卖比特币的商家

　　　　　 比特币交易，类似于买卖股票一样，低买高卖，赚取差价，更可以去交易所炒币。也可以去提供比特币兑换服务的网站去兑换，开网店的朋友也可以支持比特币付款，很多淘宝店也开始兜售比特币了。当然更多的人愿意去自己当矿工挖矿，让自己的电脑生产比特币！

　　　　　 目前，1比特币大约可以兑换14美元或者90元人民币，是不是很值钱？如此值钱且具备升值潜力的货币居然可以免费获得？没错，请接着往下看，只要您有一块不错的显卡，花几天时间你也可以赚到比特币。

　　　　　 现在我们就开始比特币淘金之路了，过程比较多但操作还是很简单的，只要您有足够的耐心。

　　　　　 首先，需要找一个产出稳定的矿池，目前全世界有三大矿池。您需要在其中选择一个注册帐号，便可以和大家一起采矿。每个矿池采用的分配方式不尽相同，需要您根据自己的硬件情况进行选择。

　　1.Deepbit：目前最大的矿池，有Pay Per Share和Proportional两种分配模式。

　　2.Slush：成立较早的矿池，产出一般但很稳定。

　　3.BTC Guild：最大的特色是免收手续费，相对便提高了收益。

　　　　　 这里笔者以BTC Guild为例，告诉大家怎么注册和使用。BTC Guild这个矿池是免手续费的，挖出来的比特币全部分给挖矿者。而其它矿池一般都要收取1.5%到2%的费用，所以BTC Guild的性价比很高，非常适合本身计算能力就比较少的个人用户及新手。它的网址是：https://www.btcguild.com/

　　After entering the BTC homepage, click Create Account to create an account

　　Please remember your username and password

　　　　　 After logging in, complete your detailed information. The most important thing here is that you need to fill in your wallet address correctly. Click Change Wallet Address, input your wallet address in the appearing page, and click the Change Address button. After changing the wallet address, you need to wait 24 hours before you can transfer the mined bitcoins to your wallet. Please remember this. As for how to obtain the wallet address, it will be told later. Leave the wallet address blank for the time being, as there is no need to withdraw or transfer it in a hurry.

　　　　　 Then, the most important step, create some job entries in Manage Workers, each representing a mining device, such as your graphics card and CPU. Generally, create as many entries as there are graphics cards. These accounts and passwords can be arbitrarily set and will be used during mining.

　　　　　 For beginners, it is recommended to use Gui Miner for mining. This mining software is very intelligent and can automatically identify all mining devices in the computer, including how many CPU cores and how many GPUs, which can all be activated to start mining.

　　　　　 Click here to download the latest version of Gui Miner 20110701, extract it after downloading, and run the guiminer.exe file in it.

　　This green software supports Chinese, so change it to Chinese and restart first
lottery localJoin us
　　

　　　　　 This software is very simple and easy to use. The operation example in the picture above is only for a single graphics card. If you have multiple graphics cards, just repeat the above steps, create multiple miners, and then run them simultaneously.

　　The device list contains 5 AMD Cayman GPUs (HD6900) and i7 processors

　　Each GPU or CPU needs to be set up separately as a miner and configured to run

　　All 12 virtual cores of the Core i7 980X can be recognized

　　　　　 Due to the low computational power of the CPU, and the fact that running the CPU will cause the system to be very slow, it will also drag down the computational performance of the graphics card (because the graphics card will also occupy some CPU resources when doing OpenCL computations). Therefore, it is not recommended to mine with the CPU, and only the graphics card should be used.

　　　　　 Now the author is building a platform for testing, using the currently excellent Core i7 980X processor, which has six cores and twelve threads. The motherboard is Gigabyte GA-X58A-UD9, with up to 7 PCI-E X16 graphics card slots, theoretically capable of inserting 7 single-slot graphics cards, but in fact, high-end graphics cards are dual-slot designs, so only 4 can be inserted.

　　All mainstream mid-to-high-end graphics cards that can be found were tested

　　Thank you to Colorful for providing the high-end AMD card for testing

　　　　　 In terms of graphics cards, there is one AMD dual-core card king HD6990, four single-core card kings HD6970, NVIDIA single-core card king GTX580, and various mid-range and low-end graphics cards. We will test their mining performance one by one.

　　　　　 In order to be able to insert as many graphics cards as possible, the test platform chose Gigabyte GA-X58-UD9, which has up to seven PCI-E X16 graphics card slots, theoretically allowing up to six single-slot graphics cards and one dual-slot graphics card to be inserted. Unfortunately, I did not have a high-end single-slot graphics card at hand, so in the end, I could only insert four dual-slot graphics cards simultaneously.

　　　　　 With multiple graphics cards and an excellent six-core CPU, the power supply must also be powerful. We chose the Anetek MAXREVO 1500W ultra-powerful power supply to ensure the stability of the entire platform.

　　● Intel Core i7 2600K (4 cores 8 threads): 19.2Mhash/s

　　　　　 Firstly, I ran a mining test on my personal computer with Core i7 2600K. This CPU was not overclocked and could boost to 3.8GHz from the default 3.4GHz. A new CPU miner was created, with all 8 virtual cores checked, and the CPU was fully loaded during mining, achieving a final performance of 19.2Mhash/s.

　　● NVIDIA GTX460 (336 CUDA Core): 55.5Mhash/s

　　　　　 Then I used my GTX460 1GB graphics card, which is a reference card with 336 stream processors, operating at 1350MHz, to run mining programs in CUDA mode, achieving a score of 55.5Mhash/s, which is 2.9 times that of i7-2600K.

　　● AMD HD6750 (720SP): 156.3Mhash/s

　　　　　 Next, I switched to an AMD card, and the mainstream HD6750 was able to achieve a score of 156.3Mhash/s, which is three times the performance of GTX460 and eight times that of i7-2600K!

　　● NVIDIA GTX580 (512 CUDA Core): CUDA performance is better than OpenCL

　　　　　 It seems that the performance gap between NVIDIA’s and AMD’s cards is indeed quite large. After switching to the excellent single GPU card GTX580 from NVIDIA, it was found that such a powerful graphics card could not outperform the HD6750. What is the reason for this?

　　　　　 NVIDIA’s GeForce GTX580, in addition to supporting OpenCL mode, also has a CUDA miner available. Under CUDA mode, the performance of GTX580 is improved by as much as 30% compared to OpenCL mode. Not only is the performance improved, but the power consumption during mining is also reduced, from 366 watts to 329 watts. This indicates that the algorithm efficiency of the CUDA miner is superior to that of the OpenCL miner, but due to the limitations of its computational power, it is still not as good as the A card with a large number of stream processors.

　　　　　 Then, the author found the mainstream graphics cards available and tested their Bitcoin mining performance one by one, and the final results are organized as follows:

　　　　　 Below, the author will make a brief analysis:

　　1. The HD6990 has two GPUs, the core frequency is exactly the same as that of the single-core HD6970, so the mining performance is doubled. In fact, the HD6990 needs to open two miners to distribute to the two GPUs for joint calculation.

　　2. The stream processor of the previous generation HD5870 of AMD is slightly more than that of HD6970, but the core frequency is slightly lower, so the mining performance of the two generations of flagship single cards is almost the same. To know that the game performance of the VLIW4 architecture HD6970 is stronger than that of the VLIW5 architecture HD5870, but the mining performance seems to depend only on the theoretical floating-point computing ability, and has nothing to do with the architecture and efficiency.

　　3. The HD6790 with Barts core has a 256Bit memory bandwidth, twice as wide as the 128Bit HD6770. But both have the same mining performance, so the memory bandwidth frequency has no effect on performance. The only factor affecting performance is the number and frequency of stream processors.

　　4. The excellent single-card GTX580 of NV is not as good as HD6750, but it is much stronger than the CPU, after all, it also has hundreds of cores.

　　　　　 Then let’s take a look at the total power consumption of the entire machine during mining, which involves the issue of return on investment:

　　　　　 Since the total power consumption of the entire machine includes power supply, motherboard, memory, CPU, hard disk, etc., it cannot be seen in proportion, but only in the numerical difference, here is for reference only.

　　　　　 As everyone knows, at the same price and level, N-Card and A-Card are roughly the same in terms of 3D game performance, with each other having the upper hand in different games, and neither having a significant leading advantage. But why is the gap between N-Card and A-Card so large in Bitcoin mining calculations?

　　The VLIW5 stream processor architecture of the HD5870/6870 series

　　This group of 5 is actually a traditional Shader (shader) in the sense.

　　　　　 It is believed that everyone knows that A-Card has a massive number of stream processors, and the number of stream processors on a top-level A-Card is more than three times that of an N-Card. AMD uses VLIW (Very Long Instruction Word) 5D/4D SIMD (Single Instruction, Multiple Data Stream) architecture, which can produce a massive scale of computational units with less transistor overhead.

　　　　　 NVIDIA has abandoned the traditional Shader architecture design since the DX10 era and developed a brand new MIMD (Multi Instruction, Multi Data Stream) architecture. All computational units are scattered, so each stream processor can reach a higher frequency, achieving higher efficiency. However, the cost is that the transistor consumption is relatively high, with NVIDIA spending a large number of transistors on the instruction发射器和distribution units, resulting in the number of stream processors in the NVIDIA architecture being far less than that of the AMD architecture for GPUs of the same scale.

　　　　　 In short, AMD is brute-forcing stream processors without considering computational efficiency, while NVIDIA has greatly improved computational efficiency but has fewer stream processors. The end result is that both sides have their strengths, almost on a par in various 3D games, while in general computing applications, the N-card has an advantage, but the leading advantage of the N-card may not be efficiency issues, but rather good software optimization and program development.

　　　　　 However, there is a situation where the N-card is at a disadvantage, if an application does not have particularly complex instructions, but only brute-force algorithms or a large amount of data to process, this mindless operation is most suitable for AMD’s architecture to handle, because it has an absolute advantage in theoretical floating-point computational power, without considering computational efficiency issues. The massive data will feed every stream processor, and they will not have any idle time, naturally approaching the theoretical value of performance.

　　The password cracking performance of the A-card is also far ahead of the N-card

　　　　　 The Bitcoin miner uses SHA-256, which is a secure hash function invented by the United States National Security Agency, generally used for encryption and decryption of passwords. This algorithm performs a large number of 32-bit integer right shift operations, which can be implemented by a single hardware instruction on AMD GPUs, while on NVIDIA GPUs, it requires three hardware instructions to simulate (2 shifts + 1 addition). Just this one feature brings AMD an additional 1.7 times computational efficiency advantage (about 1900 instructions to execute the SHA-256 compression operation, compared to NVIDIA’s about 3250 instructions).

　　　　　 In this way, AMD’s higher floating-point computational ability combined with algorithm efficiency advantages, the performance of AMD GPUs in password cracking and Bitcoin mining is about 3 times higher than that of NVIDIA GPUs!

　　　　　 At first, the author filled the platform with four HD6970 graphics cards, and found that the performance of single-card or multi-card did not affect each other after running, with very stable speed, fluctuating around 35xMhash/s, so the total computational power is 1.426Ghash/s.

　　Mining performance with four HD6970s

　　　　　 Later, a dual-core HD6990 was found, replacing one HD6970 with it, so the entire platform now has five Cayman GPUs running at the same frequency, pushing performance to a new level. The computational power of each GPU remains stable at 35xMhash/s, with the total computational power reaching 1.782Ghash/s!

　　Mining performance when using three HD6970s and one HD6990

　　　　　 The next day, a colleague found another HD5970, so the configuration of HD6990+HD5970+HD6970+HD6970 is a four-card six-GPU setup, which should be more powerful in performance. Unfortunately, there were no four HD6990s at hand, otherwise it would have been the ultimate configuration!

　　After plugging in the HD5970, the software identifies four Cayman GPUs and two Cypress GPUs

　　The total computing power of four cards and six GPUs has broken through 2Ghash/s!

　　　　　 Although the stream processors of HD5970 are more than those of HD6990, due to the lower default frequency, the computing power is not as good as HD6990. However, after replacing HD6970 with HD5970, the GPU count increases by one, and the total computing power reaches a new high!

　　　　　 According to the data monitored by the BTC Guild website, the actual computing power is almost the same as that displayed by the client, but the fluctuation range is relatively large, which may be related to internet speed and the difficulty of data packet calculation.

　　Configuration of four cards and five GPUs: HD6990+HD6970X3, total power consumption 1390W

　　Configuration of four cards and six GPUs: HD6990+HD5970+HD6970X2

　　The total power consumption reached 1420W, and the Antec power supply was still as stable as ever!

　　　　　 Do you want to know how much power consumption a system composed of an excellent six-core processor and six excellent GPUs has when running at full speed? It’s amazing to find out. The average power consumption of five GPUs mining at full speed reaches more than 1400W, which is close to the rated value of this Antec 1500W power supply, and the load is concentrated on +12V.

　　　　　 At first, the author was worried that running at 1400W for a long time might cause instability, because the author had done a lot of multi-card tests and used dual power supplies. The result is that this system ran stably for a day and a night in the company, and it is不得不赞一下安耐美电源的完美稳定性和优秀品质!

　　　　　 In fact, as more and more people join the Bitcoin mining army, the output of Bitcoin has decreased a lot compared to the past few months. The output of a 170Mhash/s HD6750 mining for 24 hours is only 0.1 Bitcoin, which is about 9 yuan RMB. After deducting electricity and internet fees, the profit may be very little.lottery help and Just click to enter

　　　　　 The mining rules of Bitcoin are that the greater the total computing power, the less proportion of the individual can obtain, which is also the fundamental reason why many JS secretly bought HD6990/HD5970 without telling others the purpose. If you also join the mining army, their income will naturally decrease.

　　Due to the popularity of Bitcoin, the sales of high-end A cards are particularly good.

　　Many people’s attitude is: even if Bitcoin is not as profitable as before, keeping the A card for gaming is still a good choice.

　　　　　 If you haven’t tried graphics card mining yet, why not give it a try according to the tutorial in this article. If you are already a downloader who doesn’t shut down your computer for 24 hours, running a mining program while downloading can definitely help you recover the electricity and internet fees. If you are planning to set up a supercomputer specifically for mining Bitcoin, it might not be cost-effective, because the current output is much lower than before.

　　　　　 比特币挖矿是继蛋白质折叠（Foding@Home）、外星人分析（Set@Home）之后的又一大显卡分布式运算程序，其共性就是GPU的运算能力比CPU强很多！挖矿器直接与金钱挂钩的性质让它从一开始就吸引了不少人专门去做挖矿运算。

　　　　　 但实际上，比特币挖矿这种无聊的算法并没有多少实际意义，世界各地用户的运算能力被白白的浪费掉了，与其让用户做一些无聊的算法，不如把运算能力收集起来卖给特殊的企业客户，这样用户在赚钱的同时，也在源源不断的为各行各业输出运算能力，这才是分布式计算的真谛！

　　　　　 最后，差点忘了告诉大家如何把挖到的比特币导出来了，这个过程最简单了，但也有风险，稍有不慎就会把比特币打给别人。

　　　　　 首先您需要一个比特币钱包地址，这个地址可以使用官方客户端提供的地址，也可以去比特币交易平台申请临时地址，笔者还是倾向于后者。您只要去btcchina.com/注册一个帐号，然后该帐号下面就会产生临时地址，这个地址只能使用一次，在接受一次比特币转账后失效，会随机产生另一个地址（这是比特币出于安全性的考虑）。

　　　　　 将BTCChina的比特币充值地址填在BTC Guild的Wallet Address一栏

　　24小时之后就可以提现了，提现结束需要更新地址，才能再次提现，切记切记

　　　　　　该网站支持通过支付宝充值或提现，您只要把从BTC Guild挖到的比特币转如BTCChina，然后兑换成人民币，最后提现到支付宝，就完成了赚钱过程。当然笔者还是建议把挖到的比特币存着，先不着急兑换，反正本来也不多。lottery tutorial and How to find it

　　　　　 最后，再为大家献上一些JS和牛人的挖矿装备，看了这些人的电脑，您就会发现笔者的测试平台根本不算啥……

　　　　　 在完成这篇评测文章的两天时间里，笔者已经通过测试平台断断续续的测试挖到了两个比特币，祝大家也能挖到比特币^_^■<