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The first part of the review of ASIC-miners Antminer S9 was devoted to setting up a primary, a general description of the device, and the most obvious problems. In this part we will focus on the daily operation Antminer S9 from the standpoint of domestic miners. Organization of large farm requires a different approach, and faces other difficulties. First, a little about the internal structure repeat Antminer S9. It is very similar to his "dad" - Antminer S7. The one-piece aluminum housing is a square tube with sides of 14 cm and serves as an additional heat sink.
The body and located therein longitudinally three boards hashing blown two fans. Each chip has two aluminum radiators, one on each side of the board. The quality of their installation is somewhat doubtful, as mentioned in the first part of the article. Datasheet on chip BM, unlike previous generations, has not yet been published by the manufacturer.
Such secrecy can say that BITMAIN expects to produce devices on the chip only at its facilities, and the emergence of the next generation can occur through a much longer period than the usual months. A further reduction of process technology is already problematic, and increase productivity by optimizing the architecture does not give significant results.
Interestingly, I motherboard is designed for four sets of boards and fans compared with the S9, and firmware pre-registered 8 fans. This means that soon we can see "even" Antminer S10 for industrial miners. This form factor has suddenly died on Antminer S4, but can still be revived. The most obvious problem, which immediately makes itself felt from the very first turn Antminer S9 - it's too noisy fans. It is not clear why the manufacturer the use of such power.
Major miners are able to provide adequate climatic conditions in the room and for the holders of one or more devices are more critical noise performance. The same can be said about the power supply, the fan speed is not adjusted.
As a result, the cooling system from the producer turned "neither ours nor yours. What remains to those who can not provide space for industrial mining? Change in the less noisy fans, and it's very simple.
As it turned out during a long operation, Antmaynera S9 performance to some degree depends on the temperature of chips and circuit boards. At 20 degrees "behind" it is easy to keep the chip temperature of about 70 degrees, and the board - about 45 degrees. With heating performance begins to fall - on a matter of interest, but still stable correlation.
When heating the surrounding air to 40 degrees, 90 degrees and 55 on the chips on the cards we receive From the stress tests at higher temperatures I managed to resist, as it violates the conditions declared by the manufacturer operation. Regarding the number of HW error the error occurs when the chip for some reason, did not respond to controller polling , then the "cold" start often appears a few hundred HW, and later their number usually grows to a few dozen per hour.
For chips is fairly modest figure. The problems may indicate the number of errors measured by several thousand in an hour, and they can generate even one defective chip. Monitoring from a smartphone. In addition to the web interface of the miners, the pool and third party applications to work by API, the manufacturer offers a mobile app that runs through the site BTC.
It is no scheduling and status monitoring chips and motherboards, but for the basic health monitoring devices and control of payments to Antpool it enough. The only thing he loses, for example, blockchain. But here, as they say, there is a caveat. To proceed, you need to specify a mobile phone number, which will activate the code.
For lovers of anonymity, especially in the context of legal uncertainty in Russia, it is not too convenient. On admission to the pool BTC program will receive a corresponding message. For a more detailed view will have to use web interface.
Most of the miners are interested in the most efficient use of the device, as the term ASIC-miners life is relatively short-lived and would like to "squeeze" out of it all you can.
With Antminer S9 occurred even more interesting incident. At least, on the apparatus described herein, MHz is really close to the limit of stable operation. In the future, even minimum, the frequency is increased out of control or the entire chip board, resulting in a total heshreyt decreases despite the fact that the temperature is relatively low and the power supply for supply power available.
At a frequency of MHz Mining completely ceases to run. Therefore, batch 2 with the default frequency is lowered to MHz, with a batch of 5 - MHz. That is, the owners of the first batch were happy owners Asik, overclocked to the limit by the manufacturer.
The main impression from Antminer S9 has been announced for the end of the first part of the review. After a few weeks of operation, you can add the device to obtain a stable, undemanding to external conditions and easy to set up, as the previous series of Ants. Even a significant increase in temperature in the room is almost no effect on performance, but to tempt fate constant overheating still not worth it. Viewed in the survey miner refers to the first serial production and turned out quite "raw" in the hardware and in the software part.
In particular, in later releases problems are not observed with pools and less noticeable performance dependence on temperature. After replacing the fan noise from the miners fell markedly, and at normal sound background it's almost unheard of even in the next room with the doors closed. In general, Antminer S9 can be considered suitable for home use, in the presence of a dedicated premises without the special provisions in addition to good insulation.
Replacement fans The most obvious problem, which immediately makes itself felt from the very first turn Antminer S9 - it's too noisy fans. Teraheshi and degrees As it turned out during a long operation, Antmaynera S9 performance to some degree depends on the temperature of chips and circuit boards.
Monitoring from a smartphone In addition to the web interface of the miners, the pool and third party applications to work by API, the manufacturer offers a mobile app that runs through the site BTC. Acceleration Most of the miners are interested in the most efficient use of the device, as the term ASIC-miners life is relatively short-lived and would like to "squeeze" out of it all you can.
Executive summary The main impression from Antminer S9 has been announced for the end of the first part of the review. Authors get paid when people like you upvote their post.