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1  Alternate cryptocurrencies / Mining (Altcoins) / How to possibly fix Gigabyte B250 Fintech not booting with more than 9 GPUs on: March 14, 2021, 09:14:38 AM

so I found a possible solution for the said problem.

Gigabyte Fintech 12 GPU B250 mining mainboard does not boot / post after connecting more than 9 GPUs.
It does not depend on which PCIe slots you use, just disconnecting any card helps, as long as there are no more than 9 connected.

.. As stated, if the problem solves by disconnecting any of the cards so that there are only 9 connected, you can quickly check if you have that specific problem. There is still a possibility, that your PSU is the problem, especially, if you built a new rig and boot up for the first time. Maybe your rig just draws too much power.
.. It still might be a riser, although you ruled that one nearly out by confirming it is not related to specific GPUs.
.. Might still be a defective component on the board.

Steps done before in no particular order, that were not related to the solution and did not solve the problem
.. Switched RAM and CPU
.. Switched RAM slots
.. Loaded defaults in BIOS
.. Reflashed recent BIOS
.. Flashed old v3 BIOS
.. Checked every setting and deactivated all unneccessary devices
.. Mining mode is enabled, 4G decodeing is enabled, primary video device is integrated GPU etc...

There seems to be a problem with some boards and also with the new 4a BIOS version. In one case it helped to just flash back version 3, but in another case, that did not help.
The solution was to flash all BIOS versions from the beginning in the right order. You need to download all the files from Gigabyte and just put the BIOS files on a USB stick in order to use the on board flash tool EZ Flash from within the BIOS. Important: Make sure to always chose the "full" upgrade of the BIOS, if given a choice by EZ flash!
So I started with 9 cards connected because I was lazy and did not want to disconnect every card. Flashed F1, then rebooted into OS, shut down. Flash F2b. F2b for some reason did not boot at all with GPUs attached. So I needed to disconnect all cards to have it boot into OS. Shut down. Flash F3. At this point your board should work fine with 12 cards again with the right settings. Do not flash F4a! This will bring back the problem. For science I did. If you do not mess up with a lot of things, flashing back to F3 fixes this again at this point.

Seems that there goes something wrong in the BIOS that gets solved only, if you flash all versions in correct order until V3 (always chose complete flash!). F4a seems to be one cause of the problem. But also boards that do not have F4a installed seem to have this problem, also fixed with the provided solution. At least for boards I had so far.

I hope this helps and I would appreciate feedback! Btw. 300 posts Smiley
2  Alternate cryptocurrencies / Altcoin Discussion / Recover corrupted Zcash wallet.dat? on: February 05, 2021, 01:24:09 PM

due to a really stupid chain of events, I ended up with a corrupted wallet.dat file of a Zcash wallet after a worst case scenario with data loss. Please do not ask about the seed phrases, I know they should have been backed up and with this exception my seed phrases are very safe for every other wallet - except this.

Now, I am trying to dump the wallet.dat for the private keys with pywallet. But when trying to dump the wallet with
python --dumpwallet --wallet=C:\*pathtowallet*\wallet.dat > wallet.txt

into a txt, I am getting

(22, 'Invalid argument -- BDB2509 the log files from a database environment')

Maybe there is another way to do this?

Thank you in advance!
3  Alternate cryptocurrencies / Mining (Altcoins) / Mining room cooling - How to modify the room on: January 31, 2021, 12:10:50 AM

I have my rigs in a basement room with a window. The room itself is 150m (yes cubic meters) big. On the one end there is a high window, like this:

At the moment, there are just 2 fans. One fan pulling 2000 m/h in through half the window and one fan pushing 2000m out through a pipe out of the other half of the window. Due to the pipe pointing to the side outside, the air does not mix outside.

Now I am planning to optimize the airflow and separate the room into a hot and a cold side. I have thought of two options:

(The grey box on the bottom is a door.)

At the moment I have all my GPUs in oben wire shelves hanging. Both options would leave me the possibility to cut holes into the separating panel, to use it to push exhaust air directly through a rig os ASIC to the hot side, if needed.

What do you recommend and why? Any other ideas or hints?

Thank you very much in advance for any advice!
4  Alternate cryptocurrencies / Mining (Altcoins) / GPU miner in closed (server) cases - need some help on: June 01, 2020, 09:43:44 AM

at the moment I have about 100 GPUs in a basement room with only one open side (former window) that serves one half air intake, other half air output with each having one big radial fan.
Temperatures get a bit uncomfortable in summer though. The room is about 150m big and I did not separate into cold/hot side because I have open air rigs with 12 cards each.

Now I want to put the cards all in server cases with delta fans and solve the temperature problem once and for all.
Can you recommend some good cases? Most of my cards are 3 slot height though (and none are blower style cards). So that's a problem with some configurations. Since I am not restricted to have them fit in server racks, the cases could be custom sized. But I barely find cases that fit 10 cards or even 12.
I tried some years ago a case with Vegas but they did not ventilate enough due to the small gaps in between them.
I am looking for small footprint, stacked, maximum airflow, high service convenience. So I can stack them, connect the intake air so the cold side, the other vent to the hot side and end the struggle in summer.

Any suggestions what I should look for?

Thank you in advance!!
5  Economy / Digital goods / Hashaltcoin Blackminer 200$ Coupons for FPGA miners on: August 22, 2019, 02:36:53 AM

I have to sell:

10x 200$ coupons for buying Hashaltcoin Blackminer F1 / F1+ / F1 mini

You can also use my referalcode XRPPAA to get another 100$ off.

Hit me up with your offer

I accept Bitcoin, Ethereum or Paypal (if wanted with the Paypal buyers insurance).

andartis [*at*] - I prefer eMail because of message limitations in the forum.
Alternatively you can send me a PN if you prefer.

6  Economy / Computer hardware / [WTB] S9 hashboard on: October 06, 2018, 04:28:29 PM
Looking for a working S9 hashboard. I have a defective one. Only reasonable prices please. I live in the EU.
7  Bitcoin / Mining support / Antminer S9 hashboard showing up correct but with 0 hashrate on: October 06, 2018, 01:44:44 PM
Hello guys,

one of my S9 looks like this:
That means everytging shows up normally, just the realtime hashrate for the board is 9.

Reflashed, rebooted, tried modded bmminer, cleaned the miner, checked all boards and switched cables and PSU.
One hashboard is just not hashing. Kernel shows it normally.

Any advice what I can do? I disconnected the board for now to reduce power by about 200w.
8  Alternate cryptocurrencies / Mining (Altcoins) / Mining room cooling - How much airflow for 20kW? on: July 28, 2018, 12:52:51 PM
Hi guys,

I have a cold basement room. It has a window, in which a ventilator is installed, that pushes 2000m3 per hour out through a short pipe and gets fresh air through an opening from outside.

The room has 90m3. But I can downsize it to 30m3.

Will 20kW of miners and some ASICs work with that ventilator?
Should I downsize the room to exchange the hotter air faster or leave it big, so it can distribute?

Thank you in advance!
9  Alternate cryptocurrencies / Mining (Altcoins) / AMD cards lead to stuttering Windows 10 after installing drivers. Any ideas? on: May 29, 2018, 09:26:44 PM
Hi guys!
I have a Windows 10 Rig (yeah, I know, Linux is better, but given it is a windows 10 rig for now). All risers are fine, I put in 6 Vega 64 and 4 Radeon 580 one at a time. All are shown fine in the device manager. Then I installed the drivers without any problems. But as soon as the drivers (18.5.1) are installed and I reboot, the system begins to stutter.
No enhanced CPU load
Cards show up in the device manager fine
But miners dont recognize them...
Fresh install
PSUs are powerful enough
All updates applied
CPU is i3

When I DDU the drivers, all is fine again.

This occured on a Gigabyte Fintec and also now on a ASUS B250 Mining Expert. I tried the ASUS I had in another Rig afterwards, because ASUS "guarantees" that the AMD cards work in the configuration shown in the FAQ. I put them exactly as shown and all slots are green. So its not a mainboard problem.

Has anybody an idea?

Thanks in advance.

10  Economy / Digital goods / Bitmain coupons: atm sold out on: April 11, 2018, 02:12:41 PM
Hey guys,

here are my remaining coupons for sale (valid for sales orders - check Bitmains coupon policies shown in the screenshot for one coupon, applies to all coupons):
**sold out atm**
I accept Bitcoin, Ethereum or Paypal (if wanted with the Paypal buyers insurance if fees paid).
If wanted, we can also use Dream escrow on Discord:

Please PM.

11  Economy / Auctions / 200$ Bitmain Coupon on: March 07, 2018, 08:51:22 PM

I have one Bitmain Coupon over 200$ valid until 2018-06-01. Please PN me if interested. I accept Paypal (if you wish with buyers assurance) or Banktransfer (European Bank account).
I will remove this post when the coupon is sold.

I uploaded a screenshot to my webspace:
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