That is what happens in the bmminer source that is available online, but there's no reason that it must work like this. With the newer firmwares or with braiins os you can adjust frequency and voltage values separately. You could even edit the old bmminer source yourself to disconnect those parameters.

I guess the lowest that you could get new 8TB green seagate drives for is 120 using purse. So 15 per TB is definitely reasonable if the drives are in good shape

I'm willing to pay $20 in total for the 2 controllers. First class rate is around $4 so you should still be left with the $15 in profit

I have a few that are hosted in your area (zip 23462) so you could probably see them in person.

I can do $450 per S9 (max 10 units, all running around 15.5 th/s) and/or $50 per APW3++ psu (max 20 units).

Thank you both for the suggestions. I did a few ROI calculations and such and we ended up going with some T17s from offordscott as a test, hopefully buying more later.

Still looking for any opportunities or group buys if they become available.

Hi everyone! Recently I've joined with some friends who are looking to source miners for a new facility in the Eugene, Oregon area (USA). The facility will hopefully be able to support up to 2 MW of equipment.

We are looking for 200-300 of Antminer T17 or similar models. Bitmain is fully sold out of btc miners right now, and I figured that this is the best place to ask around.

I'm looking for any opportunities or ideas you guys have about how we might be able to get our hands on a decent quantity of Bitmain's newer miners (S17, T17, S15, etc.). Or, perhaps we should take the plunge and get some M20S?

Please tell me your opinions on this. I have plenty of technical skill to manage the miners but little experience sourcing miners of my own..

What firmware version are you running? It's unusual for an autotune miner to have that ideal rate. I would recommend trying the May 2019 firmware (or Dec 2018, if you are uneasy about no longer having SSH access to the miner), and see if that helps.

You should test the miner with a known good PSU if you haven't already.

What is your goal? Increasing hashrate or increasing energy efficiency?

It looks like there is an issue with the PIC on chain[0] (the board that is plugged into connector J1 on the control board). I would try testing the miner with that board disconnected, if possible, to see if that is what's causing the miner to keep rebooting itself.

Just to make sure, when you are trying to flash from SD, you're moving the jp4 jumper into the other position?

On a side note, check on size and hash for /usr/bin/ntpd , some viruses I've seen overwrite that file with the payload.

You can also run "top" to see which processes are taking cpu/memory and compare those size/hash against the normal.

You can try a different PSU to be sure.. I see you are running May 2019 firmware, what tuning configuration do you have set in the options? If you are on the reduced voltage mode, it may be causing instability in your miner.

It may be a power issue, either with your grid setup, the PSU, some voltage regulators on the board, etc..

What PSU and what supply voltage are you using?

I really appreciate that offer, but I just have too many spare T9+ hashboards right now. If you could just do the control board as a first class parcel that would be great. No rush.

Do you already have the CP2102 bridge and have you wired it correctly? GND = GND, but TX and RX need to be switched. Also be careful.. GND is the middle pin on the xilinx board but not on the USB.

I used to have the chinese version of the program. I can try to find it if you really need it, but you can most likely fix your issue with the suggestions provided above.

It sounds like this is Bitmain's Antminer S9, each board has 63 asic and the singleboardtest looks for 57456 nonce, 8 from each "core", 114 cores per chip.

This is purely a hardware issue, singleboardtest does not rely on internet connection (although it could technically be PSU-related).

If you can see 63 asic on a board, but you are not getting 57456 nonce, you can check which chip is not returning all of the nonce values and replace it, assuming you have the proper equipment and experience.

PM sent! Thanks for the offer Keith. Still looking for a couple more T9+ / B3 / E3 control boards.

I would try a different control board that you know is good, so that you can tell if the hashboards are damaged or not.

This is a virus, I've seen it on machines I've worked with, mining to the exact same address.

With Antminer S9 you can sometimes do an IP Report reset and then flash one of the new official firmwares right away. Otherwise you'll want to install good firmware from an SD card, or get new control boards.

You need to make sure that you've changed all of your SSH passwords, or are using a firmware that disables SSH access.

When you SSH to a miner, you can use the passwd command to change the password, and then run cp /etc/shadow /config/shadow to apply the change (otherwise the password will revert when the miner is rebooted).

You can see that the authors of this malware are currently receiving 0.8 BTC ($7000) per day: https://www.nicehash.com/miner/3CJgXokLQrRCQcEoftS7MbPDSXhXpX6P55.

If you are not interested in trading I would be willing to pay 40 usd for each board, and I can cover shipping too if you use USPS first class.

I actually have a bunch of spare working T9+ hashboards, so I am only interested in controllers at the moment. But perhaps we could work out some type of trade.