These boards run over 110c, I would not call 82c anywhere close to overheating nor is it anywhere near the shutoff temp built into the firmware.

If you want to run two s9s on a single circuit you really need it to be 20 amp.

Both fans are the same spec from bitmain.

Bitmain sells replacement fans. Look under the support section.

As one of the few people around here that have built anything of the size you are looking for I hope you find my answers somewhat helpful. Feel free to PM me if you are still looking for a consultant.


1. This really depends on how you build your datacenter. If you do it properly with high density hot/cold isles you really dont need that much space for 10mw. I could probably fit 10mw in less than 3000 sq m.

2. This is another thing that cannot simply be answered. It depends on the hardware you buy and how many different coins you want to mine. Filled with current gen sha256 bitmain tech you could make ~11 BTC per day or more.

3. The way that crypto datacenters keep costs down is by not using traditional air conditioning. It is all about the volume of air that you can move. With say 5200 machines you will need at least 1.3 million cfm on the intake side and about 10% more on the exhaust side. It is very important to bring fresh air in on the 'cold' side so that the machines are not recycling their own waste heat.

4. In this industry the way to build in a cost effective manner is sourcing most of what you need on the secondary market. Purchasing everything you need new will cost you 10x as much. Since the secondary market prices are always in flux, there is no real way to pin down specific costs. I would say try to shoot for a build cost of less than $500k USD per megawatt if you want to be cost efficient.

Unless you have some really screwed up, inconsistent, off-grid power there is literally no reason to run a surge protector. The power supply IS your surge protector. This is another reason why you should run a server power supply over ATX like some people do. Server power supplies have protection circuitry that will throw them into protect or if it is a crazy huge spike it might kill the PSU but it wont hurt the miner.

Try an older firmware, I have seen this problem a bunch on the latest batch November firmware

The only thought is why are you screwing with the fans? The auto sensing firmware will run them as needed, you shouldnt be messing with it.

You need to look at/post kernel logs if you want any kind of diagnosis. Since there are no user servicable parts inside the answer will always be the same unfortunately. Warranty time.

The biggest issue I see is that all coins that you can mine with a PC require a pretty good graphics card. Schools usually buy pretty barebones PCs with onboard graphics and a minimum of RAM. I am not sure you will be able to mine efficiently enough to cover the power costs of doing so.

I have a fair number of machines that randomly have a hot card like this. Ive always chalked it up to chip quality, its just luck of the draw.

The T9 has 171 chips versus 189 in the S9

Oh i know, I manage over 1200 T9s and they are 10x as reliable as the S9. The problem is these are even less efficient then the original T9 at an absolutely insane price. Hence why I said this looks like a chip dump, especially if the rumors of bitmain announcing a new miner this month are true.

Just before the tool itself, I dont want any gunk going in the air tools or being sprayed on whatever im cleaning. I like the one i linked because it fits nicely in line and doesnt get in the way.

As someone that used to build custom subwoofer boxes this seems pretty expensive for an MDF box with some dryer vent attachments on the end.

Remember the Antminer is an industrial machine, it was not meant to be quiet or ran in someones apartment. Adding another $3-400 for a silencer box just seems like a bad idea.

Anything under 90c is fine on the chip temps, most people shoot for 80c or less tho. The only maintenance you really need to do is blow the machines out. IF enough dust builds up it can conduct static electricity and cause many problems. Also the fins of the heatsinks can clog up and reduce its ability to cool itself. Other than that just let it run. Fan speeds are controlled by the software so it is not something you will be adjusting.

In theory you could if you changed the controllers, cut the chassis, and added s7 boards in. The short answer is no, there is no reason to even attempt it.

Wow they must be dumping their bad BM1387 chips, those are the worst spec Bitmain miner of this generation

This sounds like a screwup from the distributor and not Canaan.

It also sounds like you have not done your due diligence if you just waited around months for emails instead of following up immediately.

If you tell someone you are giving them a $10 bill, then hand them a $5 they will do their own verification by looking at the bill and realizing something isnt right. The pool isnt just going to accept whatever razndom share number people want to throw at it.

A single GPU rig doesnt take up much space, im sure you can find a quiet corner to tuck it in