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Topic: [GUIDE] BitFury Miner Support/Tuning - page 32. (Read 148018 times)

member
Activity: 61
Merit: 10
September 25, 2013, 10:15:44 AM
plz make "how to" step4step frob back up to chainminer upgrade manual for noobs like me)

ChainMiner for M Board Version 2.X boards
DO not use this guide for Version 1x m-boards.
It will fry your chips.  This is only meant for Version 2 of the M-board.

I apologize for grammar as I took 2 sleeping pills and I can barely feel my fingers.

1.login as pi or root

2.  type "nano /run/shm/.stat.log"   if you wish to see the performance of all the chips on your board before upgrading chain miner.
(optional step)
3.(backup your chainminer version)  (this creates a copy of the folder)
a. sudo cp -a /opt/bitfury /usr/bitfury.backup
b. cd /opt/bitfury/
c. pwd  (make sure you are in /opt/bitfury)
d. ls -al (or type dir)
e. rm -rf chainminer  (this removes everything in the chainminer folder)
4.  make sure you are in the /opt/bitfury directory and not in /opt/bitfury/chainminer (it should be deleted anyway
5.  type "git clone https://github.com/bfsb/chainminer.git"
6.  it should now start getting the chainminer git.
7.  now type "cd chainminer"  you should now be in the chainminer directory
8.  type "make"
9.  Its going to take 5-10 minutes to create the chainminer...maybe longer.
 I got some warning but everything was fine after it all finished.
 it will go back to a  bash prompt when done.
9a.  Just wait...this is the longest part of doing this change..
10.  sudo reboot


very nice! thank you very much! )
hero member
Activity: 910
Merit: 1000
Items flashing here available at btctrinkets.com
September 25, 2013, 07:57:13 AM
I didnt get bitminter pool working with my bitfury, can someone help me??

what url must i insert in the web interface? "stratum+tcp://mint.bitminter.com" or "stratum.mint.bitminter.com" or something else?? the miner not start with these?!
mint.bitminter.com port 3333
hero member
Activity: 493
Merit: 500
Hooray for non-equilibrium thermodynamics!
September 25, 2013, 06:15:16 AM
Is everybody compiling stuff on the pi, or has anybody had any success cross-compiling from a more powerful machine?
sr. member
Activity: 434
Merit: 265
September 25, 2013, 05:01:55 AM
plz make "how to" step4step frob back up to chainminer upgrade manual for noobs like me)

ChainMiner for M Board Version 2.X boards
DO not use this guide for Version 1x m-boards.
It will fry your chips.  This is only meant for Version 2 of the M-board.

....

That's how I did it yesterday ... worked like a charm ... if you do it the first time ... the make command might take some minutes be sure to let it run till it gets you back to the command line ...

...
8. How to update on the most actual chainminer version (gitpull)?

... first .. if it ain't broke don't fix it ...

do backup of your actual bitfury chainminer version...

Code:
pi@bitfury ~ $ cp -a /opt/bitfury /usr/bitfury.backup
Then move to chainminer get latest version clean make ... restart ...

Code:
pi@bitfury ~ $ cd /opt/bitfury/chainminer
pi@bitfury ~ $ git pull
pi@bitfury ~ $ make clean
pi@bitfury ~ $ make

restart the miner ... and hope it will still hash ... :-)
...
hero member
Activity: 924
Merit: 1000
September 25, 2013, 04:05:44 AM
Kit #2   ;   2 h-cards; 67.517 GH/s  to 72 GH/s; stock fans;  before upgrading chain miner

1       AIfDSo  55      2.419   2.294   169     8       0       0       217    $
2       AIfDSo  55      2.076   2.262   145     23      0       0       214    $
3       AIfDSo  55      2.176   2.325   152     5       0       0       220    $
4       AIfDSo  55      2.090   2.209   146     7       0       0       209    $
5       AIfDSo  55      2.319   2.251   162     3       0       0       213    $
6       AIfDSo  55      2.448   2.357   171     10      0       0       223    $
7       AIfDSo  55      2.133   2.209   149     3       0       0       209    $
8       AIfDSo  55      1.890   2.399   132     5       0       0       227    $
9       AIfDSo  55      2.233   2.378   156     7       0       0       225    $
10      AIfDSo  55      2.019   2.146   141     12      1       0       203    $
11      AIfDSo  55      2.147   2.230   150     8       0       0       211    $
12      AIfDSo  55      2.004   2.230   140     6       0       0       211    $
13      AIfDSo  55      1.775   2.061   124     3       0       0       195    $
14      AIfDSo  55      2.090   2.251   146     3       0       0       213    $
15      AIfDSo  55      2.577   2.283   180     3       0       0       216    $
16      AIfDSo  55      2.105   2.272   147     4       0       0       215    $
17      AIfDSo  55      2.205   2.505   154     14      0       0       237    $
18      AIfDSo  55      2.677   2.410   187     10      0       0       228    $
19      AIfDSo  55      2.634   2.463   184     15      0       0       233    $
20      AIfDSo  55      2.205   2.410   154     19      0       0       228    $
21      AIfDSo  55      2.276   2.389   159     4       0       0       226    $
22      AIfDSo  55      2.377   2.431   166     6       0       0       230    $
23      AIfDSo  55      1.675   1.924   117     9       0       0       182    $
24      AIfDSo  55      2.119   2.463   148     8       0       0       233    $
25      AIfDSo  55      2.062   2.357   144     4       0       0       223    $
26      AIfDSo  55      2.248   2.431   157     17      0       0       230    $
27      AIfDSo  55      2.133   2.442   149     11      0       0       231    $
28      AIfDSo  55      2.176   2.410   152     11      0       0       228    $
29      AIfDSo  55      1.947   2.294   136     20      0       0       217    $
30      AIfDSo  55      2.262   2.420   158     18      0       0       229    $
31      AIfDSo  55      2.448   2.357   171     6       0       0       223    $
32      AIfDSo  55      2.391   2.484   167     14      0       0       235    $
speed:1760 noncerate[GH/s]:70.337 (2.198/chip) hashrate[GH/s]:74.347 good:4913 $
0:      880     34.503  36.159  2410    110     1       0       16      0      $
C:      880     35.834  38.188  2503    186     0       0       16      0      $

Kit #2 after upgrading chain miner for version 2 of the M-Board (European version with PCI-E power connectors)  It is gaining speed.  Time to test overnight.

  GNU nano 2.2.6                                                      File: /run/shm/.stat.log

1       AIfDSo  56      2.019   2.114   141     0       0       0       200     [0:0]   275     8 8 8 9 9 9 9 9 9 9 9 9 9 9 9 9         0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
2       AIfDSo  54      2.076   2.093   145     5       0       0       198     [0:1]   281     10 9 10 10 10 10 9 9 9 8 8 9 9 8 9 8    0 1 0 0 0 0 0 0 0 1 1 0 0 1 0 1
3       AIfDSo  55      2.047   2.156   143     0       0       0       204     [0:2]   277     9 9 9 9 9 9 9 9 9 9 9 9 9 8 9 9         0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
4       AIfDSo  56      2.405   2.029   168     0       0       0       192     [0:3]   297     10 11 11 11 11 11 11 11 11 10 10 10 10 10 10 10         0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0         speed up
5       AIfDSo  55      2.233   2.082   156     0       0       0       197     [0:4]   303     10 10 10 10 10 9 9 9 9 10 10 10 10 10 10 10     0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0         speed up
6       AIfDSo  56      1.818   2.188   127     0       0       0       207     [0:5]   309     7 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8         0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
7       AIfDSo  56      1.747   2.051   122     0       0       0       194     [0:6]   292     7 7 7 8 8 8 8 8 8 8 8 8 8 7 7 7         0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
8       AIfDSo  56      2.205   2.230   154     0       0       0       211     [0:7]   283     10 10 10 10 10 10 10 10 9 9 9 9 9 9 10 10       0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
9       AIfDSo  55      2.162   2.220   151     0       0       0       210     [0:8]   281     10 10 10 10 10 9 9 9 9 9 9 9 9 9 10 10  0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
10      AIfDSo  53      2.391   1.998   167     2       0       0       189     [0:9]   289     11 9 9 10 10 10 10 10 11 11 11 11 11 11 11 11   0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0
11      AIfDSo  54      2.133   2.061   149     0       0       0       195     [0:A]   287     10 10 10 10 10 9 9 9 9 9 9 9 9 9 9 9    0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0         speed up
12      AIfDSo  55      1.961   2.072   137     0       0       0       196     [0:B]   296     9 9 9 9 9 9 8 8 8 8 8 8 8 9 9 9         0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
13      AIfDSo  54      1.847   1.913   129     1       0       0       181     [0:C]   333     8 9 9 7 8 8 8 8 8 8 8 8 8 8 8 8         0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0
14      AIfDSo  55      2.162   2.093   151     0       0       0       198     [0:D]   299     10 10 9 9 9 9 9 9 9 9 9 10 10 10 10 10  0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0         speed up
15      AIfDSo  54      1.804   2.124   126     0       0       0       201     [0:E]   291     8 8 8 8 8 7 7 8 8 8 8 8 8 8 8 8         0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
16      AIfDSo  54      2.205   2.082   154     2       0       0       197     [0:F]   296     10 8 8 9 9 10 10 10 10 10 10 10 10 10 10 10     0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0
17      AIfDSo  55      2.391   2.325   167     0       0       0       220     [C:0]   249     11 11 11 10 10 10 10 10 10 10 10 10 11 11 11 11         0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0         speed up
18      AIfDSo  54      2.176   2.230   152     0       0       0       211     [C:1]   272     10 10 10 10 10 10 10 10 9 9 9 9 9 9 9 9         0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
19      AIfDSo  55      2.105   2.294   147     0       0       0       217     [C:2]   257     9 9 9 9 9 9 9 10 10 10 9 9 9 9 9 9      0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
20      AIfDSo  54      2.391   2.251   167     0       0       0       213     [C:3]   282     11 11 10 10 10 10 10 10 10 10 10 11 11 11 11 11         0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0         speed up
21      AIfDSo  55      2.806   2.220   196     0       0       0       210     [C:4]   253     13 13 13 13 12 12 12 12 12 12 12 12 12 12 12 12         0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0         speed up
22      AIfDSo  55      2.276   2.241   159     0       0       0       212     [C:5]   283     10 10 10 10 10 10 10 9 10 10 10 10 10 10 10 10  0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0         speed up
23      AIfDSo  55      1.847   1.786   129     0       0       0       169     [C:6]   365     8 8 8 8 8 8 8 8 9 8 8 8 8 8 8 8         0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0         speed up
24      AIfDSo  55      2.190   2.294   153     0       0       0       217     [C:7]   275     9 9 9 9 9 10 10 10 10 10 10 10 10 10 9 9        0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
25      AIfDSo  54      2.233   2.177   156     3       0       0       206     [C:8]   328     10 10 9 10 10 10 10 9 9 10 10 10 10 9 10 10     0 0 1 1 0 0 0 0 0 0 0 0 0 1 0 0
26      AIfDSo  54      2.448   2.241   171     3       0       0       212     [C:9]   265     10 11 11 10 10 11 11 11 10 11 11 11 11 11 11 10         1 0 0 0 0 0 0 0 1 0 0 0 0 0 0 1
27      AIfDSo  56      2.219   2.251   155     0       0       0       213     [C:A]   251     10 10 10 10 10 10 10 10 10 10 10 9 9 9 9 9      0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
28      AIfDSo  55      2.233   2.251   156     0       0       0       213     [C:B]   273     10 10 10 10 10 10 10 10 10 10 10 9 9 9 9 10     0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
29      AIfDSo  54      2.262   2.114   158     2       0       0       200     [C:C]   315     10 10 10 10 10 10 10 10 10 10 10 9 9 10 10 10   0 0 0 0 0 0 0 0 0 0 0 1 1 0 0 0
30      AIfDSo  55      2.105   2.230   147     1       0       0       211     [C:D]   297     10 9 9 9 9 9 9 9 9 9 9 9 9 10 10 9      0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1
31      AIfDSo  55      2.248   2.198   157     2       0       0       208     [C:E]   252     9 10 10 10 10 10 10 10 9 9 10 10 10 10 10 10    0 0 0 0 0 0 0 0 1 1 0 0 0 0 0 0
32      AIfDSo  57      2.434   2.304   170     0       0       0       218     [C:F]   230     10 10 10 11 11 11 11 11 11 11 11 11 11 10 10 10         0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
speed:1756 noncerate[GH/s]:69.578 (2.174/chip) hashrate[GH/s]:68.914 good:4860 errors:21 spi-errors:0 miso-errors:0 jobs:375 (record[GH/s]:69.092)
0:      878     33.214  33.506  2320    10      0       0
C:      878     36.364  35.408  2540    11      0       0
hero member
Activity: 924
Merit: 1000
September 25, 2013, 03:35:06 AM
plz make "how to" step4step frob back up to chainminer upgrade manual for noobs like me)

ChainMiner for M Board Version 2.X boards
DO not use this guide for Version 1x m-boards.
It will fry your chips.  This is only meant for Version 2 of the M-board.

I apologize for grammar as I took 2 sleeping pills and I can barely feel my fingers.

1.login as pi or root

2.  type "nano /run/shm/.stat.log"   if you wish to see the performance of all the chips on your board before upgrading chain miner.
(optional step)
3.(backup your chainminer version)  (this creates a copy of the folder)
a. sudo cp -a /opt/bitfury /usr/bitfury.backup
b. cd /opt/bitfury/
c. pwd  (make sure you are in /opt/bitfury)
d. ls -al (or type dir)
e. rm -rf chainminer  (this removes everything in the chainminer folder and the chainminer folder itself)
4.  make sure you are in the /opt/bitfury directory and not in /opt/bitfury/chainminer (it should be deleted anyway
5.  type "git clone https://github.com/bfsb/chainminer.git"
6.  it should now start getting the chainminer git.
7.  now type "cd chainminer"  you should now be in the chainminer directory
8.  type "make"
9.  Its going to take 5-10 minutes to create the chainminer...maybe longer.
 I got some warning but everything was fine after it all finished.
 it will go back to a  bash prompt when done.
9a.  Just wait...this is the longest part of doing this change..
10.  sudo reboot
full member
Activity: 148
Merit: 100
September 25, 2013, 03:20:03 AM
My board is a Version 2.3.  If you have a version 1 M board DO NOT GET THE SAME CHAINMINER BUILD AS ME.


oh and as far as my results I left the resistor the same.   the new chain miner build definately improved results.

What I also noticed is there is a even newer upload on buzzdave's links.  Is it a newer build or older build??

I have the same board version, could you post how you updated chainminer?  git pull and git clone both didn't work for me.
sr. member
Activity: 404
Merit: 250
September 25, 2013, 01:18:31 AM
I didnt get bitminter pool working with my bitfury, can someone help me??

what url must i insert in the web interface? "stratum+tcp://mint.bitminter.com" or "stratum.mint.bitminter.com" or something else?? the miner not start with these?!
member
Activity: 61
Merit: 10
September 25, 2013, 01:06:40 AM
plz make "how to" step4step frob back up to chainminer upgrade manual for noobs like me)
hero member
Activity: 924
Merit: 1000
September 25, 2013, 12:30:13 AM
My board is a Version 2.3.  If you have a version 1 M board DO NOT GET THE SAME CHAINMINER BUILD AS ME.


oh and as far as my results I left the resistor the same.   the new chain miner build definately improved results.

What I also noticed is there is a even newer upload on buzzdave's links.  Is it a newer build or older build??
newbie
Activity: 55
Merit: 0
September 24, 2013, 11:41:00 PM
Nice bump in gh greaterninja. Glad to see the improvement I saw is not a one off.
legendary
Activity: 2702
Merit: 1468
September 24, 2013, 11:36:10 PM
hero member
Activity: 924
Merit: 1000
September 24, 2013, 11:08:39 PM
Before Upgrading my ChainMiner on my bitfury rig with lots of Nonce errors  *****NOTE THIS IS A V2 BOARD*****  DO NOT GET THE SAME CHAINMINER AS ME AS I HAVE V2!!!!*******

1       AIfDSo  55      2.276   2.378   159     6       0       0       225    $
2       AIfDSo  55      2.062   2.262   144     17      0       0       214    $
3       AIfDSo  55      2.019   2.272   141     17      0       0       215    $
4       AIfDSo  55      1.861   2.368   130     30      0       0       224    $
5       AIfDSo  55      1.861   2.209   130     13      0       2       209    $
6       AIfDSo  55      1.875   2.262   131     19      0       2       214    $
7       AIfDSo  55      1.990   2.325   139     26      0       4       220    $
8       AIfDSo  55      2.248   2.251   157     15      0       10      213    $
9       AIfDSo  55      1.589   2.146   111     29      0       12      203    $
10      AiFDso  55      0.429   0.613   30      12      0       0       58     $
11      AIfDSo  55      1.503   2.188   105     15      0       2       207    $
12      AIfDSo  55      0.358   0.571   25      7       0       4       54     $
13      AIfDSo  55      1.689   2.124   118     25      0       2       201    $
14      AIfDSo  55      0.401   0.634   28      1       0       0       60     $
15      AIfDSo  55      1.704   2.061   119     13      0       0       195    $
16      AIfDSo  55      1.732   2.114   121     33      0       0       200    $
speed:825 noncerate[GH/s]:25.598 (1.600/chip) hashrate[GH/s]:30.779 good:1788 e$
0:      825     25.598  30.779  1788    278     0       38      15      1      $


After Upgrading ChainMiner



1       AIfDSo  54      2.448   2.220   171     0       0       0       210    $
2       AIfDSo  54      2.047   2.093   143     2       0       0       198    $
3       AIfDSo  0       0.000   1.057   0       84      0       0       100    $
4       AIfDSo  55      2.491   2.188   174     0       0       0       207    $
5       AIfDSo  55      2.004   2.061   140     0       0       0       195    $
6       AIfDSo  54      2.090   2.103   146     0       0       0       199    $
7       AIfDSo  54      2.162   2.188   151     0       0       0       207    $
8       AIfDSo  55      2.591   2.220   181     0       0       0       210    $
9       AIfDSo  54      2.362   2.220   165     2       0       0       210    $
10      AIfDSo  54      1.890   2.220   132     0       0       0       210    $
11      AIfDSo  54      2.076   2.209   145     1       0       0       209    $
12      AIfDSo  56      2.162   2.167   151     1       0       0       205    $
13      AIfDSo  56      2.448   2.220   171     2       0       0       210    $
14      AIfDSo  54      2.391   2.241   167     0       0       0       212    $
15      AIfDSo  54      2.434   2.188   170     0       0       0       207    $
16      AIfDSo  53      2.434   2.283   170     7       0       0       216    $
speed:816 noncerate[GH/s]:34.030 (2.127/chip) hashrate[GH/s]:33.876 good:2377 e$
0:      816     34.030  33.876  2377    99      0       0

hero member
Activity: 924
Merit: 1000
September 24, 2013, 08:41:00 PM
Quote

Yes, the resistor is 10k, but people are measuring it in-circuit and getting distorted values.

Oh ok, that makes sense now.

So another question for you. Do you happen to know what the masterboard rated safe wattage is. From what I've seen a full loaded bitfury setup takes around 400 watts. Being that there are 2 6 pin pci express connectors which are normally rated for 75 watts and an 8 pin is rated for 150 watts. Both the 6 pin and 8 pin have 3 hot wires while the 8 pin has 2 more grounds.

With an overclocked complete bitfury 400 ghash units possibly overclocked to 500 ghash or more, do you think the master board is capable of handling 500-600 watts through just 2 6 pin pci express connectors. I know most quality psu's use 18 ga wire which can handle 10 amps each (not that I'd want to run that much current through 18ga), would mean the wire is good for 600 watts, but is the masterboard capable of this?

Otheriwse it may be better to only run 12 overclocked boards in each master and just run additional masterboards and raspberry pi's to not over draw to much current




This is a major concern of mine as well.  I think some power supplies will get melted if OC and max capacity (all 16 slots) take place.
legendary
Activity: 1400
Merit: 1000
I owe my soul to the Bitcoin code...
September 24, 2013, 08:37:11 PM

With an overclocked complete bitfury 400 ghash units possibly overclocked to 500 ghash or more, do you think the master board is capable of handling 500-600 watts through just 2 6 pin pci express connectors. I know most quality psu's use 18 ga wire which can handle 10 amps each (not that I'd want to run that much current through 18ga), would mean the wire is good for 600 watts, but is the masterboard capable of this?


Short answer,  yes.

The six 12v lines coming from the PSU are good to at least 9A each so more than enough margin.  The board appears to be able to handle the increased wattage so far.
sr. member
Activity: 317
Merit: 250
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September 24, 2013, 07:31:41 PM
Quote

Yes, the resistor is 10k, but people are measuring it in-circuit and getting distorted values.

Oh ok, that makes sense now.

So another question for you. Do you happen to know what the masterboard rated safe wattage is. From what I've seen a full loaded bitfury setup takes around 400 watts. Being that there are 2 6 pin pci express connectors which are normally rated for 75 watts and an 8 pin is rated for 150 watts. Both the 6 pin and 8 pin have 3 hot wires while the 8 pin has 2 more grounds.

With an overclocked complete bitfury 400 ghash units possibly overclocked to 500 ghash or more, do you think the master board is capable of handling 500-600 watts through just 2 6 pin pci express connectors. I know most quality psu's use 18 ga wire which can handle 10 amps each (not that I'd want to run that much current through 18ga), would mean the wire is good for 600 watts, but is the masterboard capable of this?

Otheriwse it may be better to only run 12 overclocked boards in each master and just run additional masterboards and raspberry pi's to not over draw to much current

sr. member
Activity: 251
Merit: 250
September 24, 2013, 03:59:57 PM
Thanks cscape for the information. I'll be modding probably at least 150 of these boards between my setup and friends being I have a nice soldering station and hot air station so I'll try a variety of these resitance values. Do you have an idea of what 2.2k ohms and 2.7k ohms equates to approximate voltage values. It will be interesting to see how these boards perform.
2.2k results in about 0.75V. I haven't tried 2.7k yet, but I did try 3.3k, and that was too much.

Quote
oh yeah did you see my question in the above post about the potential error I highlighted in orange about the R02F resistance values.
Yes, the resistor is 10k, but people are measuring it in-circuit and getting distorted values.
sr. member
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September 24, 2013, 03:34:56 PM
Wattage isn't important, but you should pick a resistor with low temperature coefficient, to reduce the effects of a warming board causing the voltage to drift up.

Also, as well as 1.5k you should get 2.2k and maybe 2.7k.

Thanks cscape for the information. I'll be modding probably at least 150 of these boards between my setup and friends being I have a nice soldering station and hot air station so I'll try a variety of these resitance values. Do you have an idea of what 2.2k ohms and 2.7k ohms equates to approximate voltage values. It will be interesting to see how these boards perform

oh yeah did you see my question in the above post about the potential error I highlighted in orange about the R02F resistance values.
sr. member
Activity: 251
Merit: 250
September 24, 2013, 03:20:08 PM
Wattage isn't important, but you should pick a resistor with low temperature coefficient, to reduce the effects of a warming board causing the voltage to drift up.

Also, as well as 1.5k you should get 2.2k and maybe 2.7k.
sr. member
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September 24, 2013, 02:37:45 PM
I'm going to be hardware modifying my boards when I get them. If you're doing the pencil mod using a graphite pencil you'd modify resistor R02F to get a lower ohms reading between 1.1k-1.2k ohms. From my reading it appears this increases the voltage.

Now if I'm actually going to be desoldering and from reading c-scapes post it seems to be better to desolder R01F resistor and increase the resistance to 1.5k ohms which bumps the voltage from .65v to .70v.

Is there a reason why one should hardware mod R01F resistor over hardware modding the R02F resistor. To me it appears both mods accomplish doing the same thing, that is bumping up voltage which increases clock speed.


R01F resistor I'm looking at getting. Which of these 3 would you recommend. I know the thin film resistors are typically more precise at .5%, or should I go with the thick film 1% tolerance that can handle more wattage. I wasn't sure of the minimum resistor wattage recommended.

Thin Film low watts 62.5 mW
http://www.mouser.com/ProductDetail/Susumu/RR0816P-152-D/?qs=%2fha2pyFadujrU2xFewWLBjwEx2mjC6RiRlpijhODKY4%3d

Thick film high watts 250 mW
http://www.mouser.com/ProductDetail/Vishay-Dale/CRCW06031K50FKEAHP/?qs=sGAEpiMZZMu61qfTUdNhG9YJum83zc0DZxAhkoNdosw%3d

Thick film 100 mW
http://www.mouser.com/ProductDetail/Vishay-Dale/CRCW06031K50FKEA/?qs=sGAEpiMZZMu61qfTUdNhG7Gzy2l2IcrzI0BRrlOBedI%3d


Also I believe their is an error here. In the picture below it says R02F resistor is 10k ohms but right below that it says for the pencil mod to verify it is 1.3k ohms. I bolded the words in orange so others can verify this



Note: if you accidentally mess up the capacitor next to the resistor (C10F), and you wish to replace it, use 1nF, 50V, X7R type. Similarly, resistor R02F is 10k, 1%.
[/quote]


a) Get an Ohmmeter or DMM

b) Get an HB or softer Pencil

c) Locate R02F resistor. Donot mod R01F.

d) Make sure R02F measures 1.3KOhm

e) Rub pencil on the surface of R02F 3 - 4 times

f) Measure resistance, if it's 1.2K plug the board in

g) Measure output voltage, and repeat steps e,f if necessary for fine-tuning Wink

h) Hash like a boss

i got those pictures sent from a user ...

to guide through the process of the pencil mod ....

***be aware that you loose warranty of the h-board in doing this ... and you can brick your board!!!***

details:

- temp +10-15°
- 1.6 times higher electricity needed
- up to 50% increased hashrate

Step 1: unplug your h-board ... and locate the R02F Resistor



Step 2: use ur multimeter on the resistor and verify that it shows 1.3k Ohm



Step 3: use a HB (medium grade) pencil (http://en.wikipedia.org/wiki/Pencil) and rub 2-3 times



Step 4: use ur multimeter on the resistor and check how much it was lowered in resistance ...as long as your higher then 1.2k restart step 3 & step 4 ... if it is under 1.2k just swip a little with your finger ...

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