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1  Alternate cryptocurrencies / Mining (Altcoins) / Mining on Windows 10 and possibly fixing lower than expected hashrate on: January 23, 2021, 10:01:59 AM
We already know the bloatware called Windows 10 can throw sand into your mining operation.  
Recently, I discovered a very undesirable thing about Windows. By default it will steal as much as 85% of your network bandwidth, to upload to M$oft statistics about your network traffic.   I discovered that this impacts hashrate at the poolside as well.  
Look at the image at

These are all Windows 10 rigs mining Monero.
The first figure shows one rig, rigasus97a where Windows is stealing 85% of the network bandwidth of that rig, whereas all the others have this "feature" turned off.
The lower figure shows the reported hashrate after I fixed it on the rigasus97a rig.  See the difference in the graph?
You will no doubt want to fix this on your Win10 rigs.  Luckily, there is a Youtube video by Chris Titus on how to turn the above bandwidth stealing off.  Check out
Would be interesting to see if others have the same experience.
2  Alternate cryptocurrencies / Mining (Altcoins) / ETH Hashrate drop on Polaris 8GB cards? on: December 09, 2020, 07:32:03 AM
I have a rig with RX 470 8GB cards mining ETH and they were running at around 30MH/s each, but today I noticed a drop in hasrate to around 29-29.5  on all of them.   Surely, they should not be affected by the increased DAG size yet?  Any of you noticed the same?
The current driver version is 18.5.1.   All cards are BIOS modded.   I wonder if a higher driver version will bring hashrate back up to 30?
I already checked ping rates and they are unchanged.
EDIT: I am using Phoenixminer 5.1c
3  Alternate cryptocurrencies / Mining (Altcoins) / Single GPU quit on my Ryzen-based rig -this is what I did to get the rig to boot on: March 31, 2020, 06:59:05 PM
This is a story on how I managed to boot a headless rig when the mobo had entered into the BIOS.

My one month new MSI RX 5700 Mech GP Edition decided to quit on me this morning  Angry.  I could not get it undead.
I suspect maybe memory got damaged by heat - I found it was impossible to mine with it and keep the hot spot temperature under 100 degrees while mining ETH.  I watched a Youtube vid on that same card where they found the thermal pads did not cover the mem chips.
I took the GPU out of the rig, then faced a new problem:  How to boot the now headless rig back into Windows without a GPU since the Ryzen 3700X CPU in it doesnt have a built in GPU to drive the display.  The mobo I have is an ASUS TUF 450M.

I know the mobo usually enters into the BIOS after a hardware change.   I was not able to RDP into it from my laptop.
After a lot of trials with reboots and new keyboard sequences I found the correct key sequence to get it to exit BIOS and boot into Windows.  Immediately after power-on, I hit the Delete key and held it down for a few seconds until I was confident it was now in the BIOS.  I then pressed F10 and Y to confirm.  And then it booted into Windows.
The rig is now cpu-mining Monero while waiting for a GPU replacement.  I will have to RMA that defective GPU. 
4  Alternate cryptocurrencies / Mining (Altcoins) / Mining with Claymore 11.4 - GPU 3 core voltage suddenly jumps for unknown reason on: March 19, 2018, 05:13:12 PM
Hi folks.
I recently upgraded my rigs from Win 7 to Win 10, just to be able to mine ETH (again) since AMD driver compute mode only works with Win10.
After the upgrade I have had quite a few issues with Win 10.  The most annoying thing is this.
I have two rigs with 4 cards each, both a mix of RX 470 and 570.  The claymore ETH miner version 11.4 is great. All cards hashing away at 29-30MH/s no problem.  All cards running at 1100/2000 core/mem frerq.  After a while GPU 3 core voltage will jump from 856 mV to 1019 mV.    The same happens on the other rig:  again voltage goes from 887 to 1019 mV.     WTF???
So those cards get really hot after a while.  From 60c to 75c
I have to fiddle with Watttool to get the voltage setting back down to 800-voltage level.  I tried OverDriveNtool - same behavior.
I suspect its a GPU driver issue, knowing the overall shittiness of AMD drivers.   I am using Adrenalin 18.2.1 from Feb7.
If anyone already experienced this problem, then please share a solution.  I am quite pissed as this sudden voltage jump threatens the  health of my cards.
5  Alternate cryptocurrencies / Mining (Altcoins) / RX 570: mem straps msi and sppahire - interchangeable? on: May 26, 2017, 04:04:13 PM
So I have
Sapphire Nitro+ RX570 4G
MSI RX570 Gaming X 4G
They both have Hynix memory, which is good.

The Sapphire card does 29.5MH/s ETH mining, while the MSI card "only" does 28.3 at the same core/mem speed (1100/2075)
Now, I wonder, if I can bios mod the msi card using mem straps from the sapphire card.
I guess I need to confirm that they both use the same memcontroller chip, right?

The memstraps @ 1750 for these two cards (after I doreymilled them):
999000000000000022559D0031625C489055131339CDD50A004006007D0514206A8900A00200312 010123037AD2C3A17
777000000000000022C29C0010625C46A0551013B50BD509004006007C0514206A8900A00200312 010112E369D293616

Yeah, they are sufficiently different to make me have doubts.
6  Alternate cryptocurrencies / Mining (Altcoins) / Setting up new rig - mobo is Asrock Fatal1ty Killer Z87 - fails with 3xGPU on: April 12, 2017, 10:03:06 AM
I picked up a second hand mobo for a good price - Asrock Fatal1ty Killer Z87 board.
It has 7 pcie slots - 3 x 16 and 4 x 1, so I thought it should be good for gpu-mining.
I got Win 7 installed with drivers and connected 2 x RX 470 cards directly into two of the x16 slots
and claymore eth miner was running fine.

As soon as I install a 3rd card in one of the pcie x 1 slots via powered riser, then upon
reboot the rig hangs with all the gpu fans spinning seemingly at max (It was quite loud). 
I know the riser is good as I was using that one in another rig.
In the BIOS there is only option to set the x16 slots to Gen 1, Gen 2 and Auto.  I had all
three set to Auto, so that didnt work.  There is no option to set the pcie 1 slots to Gen 1 as
they are already Gen 1, right?
I never got so far as to try setting the x16 slots to Gen 1. If that fails what else should I try?
The PSU is a 760Watt Corsair AX760, the kill-a-watt with two cards mining eth showed 230Watts
so power is ok.

7  Alternate cryptocurrencies / Mining (Altcoins) / Got new Sapphire RX 470 Nitro+ 4Gig card - slightest BIOS mod bricks the card on: November 29, 2016, 07:53:24 PM
I am trying to BIOS mod my brand new RX 470 card ever so slightly with Polaris bios editor (just reduced Max. Mem Freq from 2100 to 1750 in the Powerplay menu).  
After cycling power the rig wont boot.   Brick..  
I have to switch to the 2nd BIOS to boot, then switch back to flash card with original BIOS.
Driver is Crimson 16.10.3, on Win 8.1.
Has anybody else had this problem and managed to resolve it?
I had no problem doing the BIOS mods on my other RX 470 cards (which are all 8Gig variant).

I wonder if Polaris BIOS editor has problem with the BIOS of the 4Gig model?
I can see the memory info is f.. up in the editor - because of mem straps for both Elpida,Hyunday,Samsung mem types?
Ow well, I guess I will have to try to mod using a hex editor instead and fix the check sum manually.
8  Alternate cryptocurrencies / Mining (Altcoins) / Z170 Motherboard for mining with at least 4 gpus - any success stories? on: November 23, 2016, 05:05:32 PM
Has anyone succeeded in getting a miner going with at least 4 gpus on a Z170 motherboard?
With Black Friday coming I might get one if I hear it can be used with at least 4 gpus.

I am thinking about the MSI Z170-A Pro in particular, which seems like a good deal - now $90 only at newegg.
9  Alternate cryptocurrencies / Mining (Altcoins) / One way to undervolt R9 300 series cards by BIOS mod on: May 08, 2016, 10:09:36 AM
Inspired by the excellent work recently by Eliovp (Thread on undervolting Nano cards),
I set fore to find out if I could successfully undervolt my R9 380X and 390 cards by
modding the cards bios.  
The short answer is Yes in both cases.
THe background I wanted to save some Watts while mining Eth.  I had successfully undervolted
my 280X cards earlier.

You can do the same!
If you are willing to mess with the BIOS of your card to save some Watts, then please
read on, but consider the risk.  You can brick your card, i.e. your computer wont start
after BIOS flash.  You will need to understand the risk and know how to recover a
bricked card.  Also, consider that you will void any warranty on your card when
you flash the BIOS.  I will not be held responsible.
If you are still reading, then I assume you are fine with the above warning.

Here is a brief how to undervolt the 390.

You need the following software:   ATIflash and HawaiiBiosReader.
You can download the latest ATIflash from TechPowerUp.  Version 2.71 works fine.
Download HawaiiBiosReader from GitHub.  Google it to find it.
You should already be familiar with how the ATIflash tool works. I wont go into
the detail here. Instead you can read Eliovp's thread. He describes it in detail.

TBH I didn't use the HawaiiBiosreader myself. I ended up creating my own utility to
alter the voltage tables myself.  But the effect is the same and this description assumes HawaiiBiosReader.

1. Get the stock bios from the card:  atiflash -s 0 card390_orig.ROM
This cmd will read the BIOS from card in slot 0 and store it in the file card390_orig.rom
Backup this file so you can restore the original BIOS to the card later.

2. Run HawaiiBiosReader.  Open file card390_orig.ROM.  
You will need to modify the voltage values in 6 tables. Note that the voltage
values you choose will have to be the same in all the 6 tables.  And for each row,
the next value will have to be same as previous or increase.

There are two tables under the Powerplay tab and 4 tables under the Limit tables tab.
The values you want to change are in the vol column in all the 6 tables.
You may leave the value in the first row in all tables as is.
The other values are pointers into the BIOS voltage table. Those values depend on
the chip quality.  Dont worry about that.
You will replace these pointers with real voltage values (in mV).
At this point you will have to take great care!
The voltage values you are about to enter will have to be values divisible by 6.25
(socalled SVI2). For example, you should not enter 1111, but 1112 is near enough, so it is fine.
Here are the values I finally loaded into the tables for my Sapphire R9 390 Nitro
and that I found is working great at stock frequencies 1040/1500.
You may want to start off using higher values.  For example, try 1150 in the DPM7 row.
Then gradually work your way down.  
Do not change anything else other that the voltage values.  When done, save to a file,
for example card390_1150.rom

3. Flash the card:   atiflash -p 0 card390_1150.rom
This assumes the card you want to modify is in slot 0.
You might want to try the -f switch if atiflash complains.
Sit back and wait for the flash to complete. Then reboot your computer and
test.   You may want to run your miner for a good few hours before you can conclude
on stability and whether you can undervolt further.

For the R9 380X card the procedure is similar, but again I ended up writing my own
utility to modify the BIOS.  I studied the code that was written by Hedzin.

At stock frequencies I was able to reduce power consumption of the 380X by 40Watts
and the 390 by ~48Watts.  Specific power consumption:  380X  ~140W, 390: ~167W
380X is hashing at 20MH/s (7Ws/Mh), 390 is hashing at 27MH/s (6.18Ws/Mh)

NB! You may not be able to undervolt further in Afterburner, Trixx, etc.  
Depending on your card you may not be able to overclock the core after
you have done undervolting.

Happy mining!

EDIT: I just checked the temperature of my single 390 mining at 1040/1500.
Sensor 0: Temerature - 58.00 C
Fan speed: 38%
Ambient temperature: 23 C.
I tribute the low temperature to the excellent tri-fan cooler of the Sapphire card, and of course the lower voltage.

For those interested in Hawaii bios editing in general you can read this very comprehensive writeup
by gupsterg.  I find that guide very valuable.

EDIT 20160816:
For thos of you who happen to have the Sapphire 380X or 390 Nitro cards  I here provide som ROMs
that you can try on your own cards.  If you are running with stock BIOS then these will save you 40 Watts per card easy.
You should be familiar with atiflash and aware of the risk involved in
flashing the BIOS of your card. I bear no responsiblity for any damage.

Sapphire 380X Nitro 1081mV ROM:

Sapphire 380X Nitro 1100mV ROM:

Sapphire 390 Nitro 1100mV ROM:

Sapphire 390 Nitro 1106mV ROM:

10  Alternate cryptocurrencies / Mining (Altcoins) / Moving to Xubuntu 14.04 - Now AMD driver doesnt detect my second card on: January 31, 2016, 06:13:47 PM
This has probably been up for discussion several times before, as is shown by the search list returned by google.
I recently upgraded one of my rigs from Xubuntu 12.04 to 14.04.
I installed the fglrx-updates driver from the Settings->Additional drivers menu
Then I ran the usual initializion to get the software to recognize my cards (one R9 280X, one 7970)
>sudo aticonfig --lsa
>sudo aticonfig --adapter=all --initial -f
* 0. 01:00.0 AMD Radeon HD 7900 Series
  1. 05:00.0 AMD Radeon HD 7900 Series

* - Default adapter
Uninitialised file found, configuring.
Using /etc/X11/xorg.conf
Saving back-up to /etc/X11/xorg.conf.fglrx-2
>sudo aticonfig --adapter=all --odgt
Adapter 0 - AMD Radeon HD 7900 Series
            Sensor 0: Temperature - 29.00 C
ERROR - Get temperature failed for Adapter 1 - AMD Radeon HD 7900 Series

This worked fine under Xubuntu 12.04.   In fact I reverted back to my 12.04 usb stick to verify it.
That version even recognizes the rig to have one 280X card and one 7970..

Any suggestions as to what to try to get 14.04 to recognize both my cards correctly?

11  Alternate cryptocurrencies / Mining (Altcoins) / Linux wont recognize my Sapphire 7970 Vapor-X anymore on: February 02, 2015, 06:57:43 PM
This card was sitting in a rig with 2 other R9 280X cards running sgminer 5 under Ubuntu 12.04 when suddenly the
miner hung and top command revealed  Xorg at 99% cpu.  Driver problem, I thought and rebooted the rig.
But Ubuntu refused to boot up.   I took the card out and inserted into another rig.  This time the machine booted
but refused to start X.  Stock driver under 12.04.
I took the card out and into a Windows 7 machine.  This machine booted no problem and I was able to start sgminer.
Now, however, I am not able to adjust core or memory frequency thru sgminer, only fan % is adjustable. 
I am able to adjust these parms from Sapphire Trixx, however.
Anyone has a clue what is going down here?

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