GridSeed 5-chip USB miner voltage mod

[ZiG]

No, I'm using windows.

If you or anyone here has or downloads the larger Allegro package and get a moment could you lift the center chip and tell me if you think all the DGND points under the chip need to be connected.  You can drag the chip to the side and see all the connections. That's my latest plan to try to bring two more chips back online.  I tried to build a solder pad there but it won't stick.  Next is to try a conductive paint or I'll use small wires to connect all the points.  

I'm looking for some opinions on whether all the DGND points under the chip (the center chip has been removed on this pod) need to be connected and if a conductive paint would be good enough.  The two chips that are working are very happy at 1200Mhz, steady 200 kh/s for days now.

Do you have a picture...?

[happydaze]

No, I haven't taken a photo of "SuperPod" or "FrankenPod" 

This should give an idea of what I see:



When I removed the burnt chip I also removed the metal base of the chip.  In hindsight, I think I should have removed the burnt top of the chip but left the metal base and making sure there were no electrical shorts.  Someone may benefit from that mistake. My pod just has the woven PCB material there now with a bunch of small metal pinholes now.

Chips 2,3 & 4 were working before the center chip went up in smoke.
Now chips 0 and 4 work with the center chip removed.
Chip 1 is the center chip.

[cbutters]

Hey everyone, take a look at this screenshot:



Im noticing that the average for accepted sharess for the timeframe on the screenshot for gridseeds 0,3,4,5,6,7,8,9 is 2525
The average accepted shares for the timeframe on the screenshot for gridseeds 1 & 2 is 2021

Considering they are all roughly the same frequency, 2021 accepts average out of 2525 is .800396

Considering there are 5 chips on gridseeds, does this mean that only 4/5 of the chips are working on my gridseeds units 1 & 2?

if only 4 out of 5 chips were running on the gridseed that would also equal = .80

Am I correct in my assumptions and only 4/5 chips are working on these gridseeds; can anything be done to make these chips run correctly and or has anyone else experienced this?

Full disclosure I have performed the 47K resistor VMOD3.

[highwalker]

I will start a new thread when ready but in the meantime I would like to share with you the work in progress behind this new project based on sandor cpuminer.

I'd like to test it with a great bunch of pods (20 or more) but I have only 3 now, may be someone of you could test it? It requires a linux controller like a raspberry with a web server (something like a Scripta img should work very fine, just change the document root to the Minera directory).

If there is someone who wanna try it please leave me a PM, I think I will release a public beta-version next week.

Hope you like it:

Quoted for awesomeness, I applaud your efforts.

Thanks sandor
Do you think it's possible to add an option to cpuminer to detect automatically the gridseed devices? Of course you will not be able to set per device freq with this option on but it would be useful to start the command in autotune without writing every single dev in the launcher string. I think looking at the dev ID do the job, Gridseed has always 0483:5740 as ID.

I used a bruteforce search method with this script:

#!/bin/bash
# options
NUM_DEVS=2

# initialize an Array
DEV=(/dev/ttyACM0,/dev/ttyACM1);
 
## Script Begin ##
 COUNTER=0
 FOUND=0
 echo -e "Searching for devices...please wait\t"
 while (( 1 )); do
          if [ -c /dev/ttyACM$COUNTER ]; then
                  DEV[$FOUND]="/dev/ttyACM$COUNTER";
                  (( FOUND++ ))
          fi
          if (( $FOUND >= $NUM_DEVS )); then
                  break
          fi
          ((COUNTER++))
          sleep .5
# Change Counter value check based on number of devices
          if (( $COUNTER >=10 )); then
                  echo -e "Found only $FOUND devices out of $NUM_DEVS...Please check USB connections & devices.\n\nExiting...\n"
                  exit 1
          fi
  done
 
  echo -e "Found devices ${DEV[0]}, ${DEV[1]}\n"
### End bash script

HTH...

[geetash]

will this mod work with hashra controla?

The mod will work for any mining software, you just need to change the chip frequency.

Nervous to attempt, but an extra 100 khsh across 20 miners translates to an extra 2Mhsh. Anyone want to share any best practices aside from OP?

I did the 49.9k mod on all 14 of my gridseeds and I'm glad I did. I'm running CPUminer and all of my chips are stable at 1200mhz and up. The pool and CPUminer and both reporting very close to each other so I'm happy!!

Thanks for the follow up; can you list the tools/hardware you used and your new hash rate? Also if possible, anyone know the page in thus thread where I find the 49.9k mod offhand?

Go back to page 1, search for - wolfey2014 - all my posts will come up, and all shall be revealed to you

Thanks Wolfey,

I'm still a bit confused though:

what's the better mod between these two below? The guy I have doing it is only familiar with 47k mod.

VMOD 3: (47k): Up to freq=1175 (500kH/s poolside average)  30 +/-4 watt
VMOD 3: (49.9k): Up to freq=1200 (510kH/s poolside average)   33 +/-4 watt

i have used 48k resistors (measured and selected from a pack of 5% 47k 1/8W resistors) to mod my pods and they are running at 1200MH/s with almost zero hardware errors with a power consumption of 25w~ per each measured with a kilowatt meter. power supply is a 850 silver.
i don't know who got this readings but its not consuming 30+ watts.

What controller are you using? I'm on hashra controla.

im running them on windows pc, cgminer+cgwatcher
ps. i have modified few miners with 51k resistors and they consume 28-30 watts and running at 521-526 Kh/s with almost zero hardware errors

[Ranma13]

I used a bruteforce search method with this script:

#!/bin/bash
# options
NUM_DEVS=2

# initialize an Array
DEV=(/dev/ttyACM0,/dev/ttyACM1);
 
## Script Begin ##
 COUNTER=0
 FOUND=0
 echo -e "Searching for devices...please wait\t"
 while (( 1 )); do
          if [ -c /dev/ttyACM$COUNTER ]; then
                  DEV[$FOUND]="/dev/ttyACM$COUNTER";
                  (( FOUND++ ))
          fi
          if (( $FOUND >= $NUM_DEVS )); then
                  break
          fi
          ((COUNTER++))
          sleep .5
# Change Counter value check based on number of devices
          if (( $COUNTER >=10 )); then
                  echo -e "Found only $FOUND devices out of $NUM_DEVS...Please check USB connections & devices.\n\nExiting...\n"
                  exit 1
          fi
  done
 
  echo -e "Found devices ${DEV[0]}, ${DEV[1]}\n"
### End bash script

HTH...

There's no need for something so complicated. This will work just fine:

Code:

minerd -o stratum+tcp://pool.com -u USERNAME -p PASSWORD --gc3355-autotune --gc3355=`ls -m /dev/ttyACM* | sed -e 's/, /,/g' | tr -d '\n'` --freq=1200

[highwalker]

There's no need for something so complicated. This will work just fine:

Code:

minerd -o stratum+tcp://pool.com -u USERNAME -p PASSWORD --gc3355-autotune --gc3355=`ls -m /dev/ttyACM* | sed -e 's/, /,/g' | tr -d '\n'` --freq=1200

That is indeed elegant, thanks.

[sandor111]

There's no need for something so complicated. This will work just fine:

Code:

minerd -o stratum+tcp://pool.com -u USERNAME -p PASSWORD --gc3355-autotune --gc3355=`ls -m /dev/ttyACM* | sed -e 's/, /,/g' | tr -d '\n'` --freq=1200

That is indeed elegant, thanks.

Not needed anymore in v0.9f
Replace --gc3355=... with --gc3355-detect and it will detect all GC3355 devices automatically.

[Coolb2]

I got a quick question, my local electronic store have 49.9k resistor, bit it's not marked what the tolerance is, what difference would it make if it's 1% or 5% .?

Coolb2

[wolfey2014]

I got a quick question, my local electronic store have 49.9k resistor, bit it's not marked what the tolerance is, what difference would it make if it's 1% or 5% .?

Coolb2

1% +/- within 49.9k indicated value
5% +/- within 49.9k indicated value

But most likely if they are 49.9k, they are probably 1%.

I'm using 1% and 5%. There's little difference in power consumption / performance one way or the other.

Enjoy your extra hashes!

Wolfey2014

[dyland]

Ok, so I have the 47.7 mod on my twenty miners and they are running on hashra with about 9% rejection rate at 1200khz, but that's not my problem.

The bigger problem is hashra is showing me at 10.2M, but my pool (clever mining) is only showing half that amount, 5M.

Any ideas on this from anyone?

Thanks in advance.

[suchmoon]

Ok, so I have the 47.7 mod on my twenty miners and they are running on hashra with about 9% rejection rate at 1200khz, but that's not my problem.

The bigger problem is hashra is showing me at 10.2M, but my pool (clever mining) is only showing half that amount, 5M.

Any ideas on this from anyone?

Thanks in advance.

I'm not familiar with hashra, but does it show accepted shares? You can do the math based on that and figure out if the pool is wrong or if you are not really mining at that speed.

[Coolb2]

I got a quick question, my local electronic store have 49.9k resistor, bit it's not marked what the tolerance is, what difference would it make if it's 1% or 5% .?

Coolb2

1% +/- within 49.9k indicated value
5% +/- within 49.9k indicated value

But most likely if they are 49.9k, they are probably 1%.

I'm using 1% and 5%. There's little difference in power consumption / performance one way or the other.

Enjoy your extra hashes!

Wolfey2014

Thanks Wolfey, you're the MAN

[dyland]

Ok, so I have the 47.7 mod on my twenty miners and they are running on hashra with about 9% rejection rate at 1200khz, but that's not my problem.

The bigger problem is hashra is showing me at 10.2M, but my pool (clever mining) is only showing half that amount, 5M.

Any ideas on this from anyone?

Thanks in advance.

I'm not familiar with hashra, but does it show accepted shares? You can do the math based on that and figure out if the pool is wrong or if you are not really mining at that speed.

It shows accepted shares, but I have a 17% reject rate and last night ran my 20 pods at 800khz and when I woke up there were 361 HW errors.

Something is wrong, and I'm assuming it's the hashra controla used with voltage mod---despite more than a few people on this thread saying that it would work.

[RowanX]

I've unscrewed my gridseed but it won't seem to come apart. Brute force required?

[jamieb81]

I've unscrewed my gridseed but it won't seem to come apart. Brute force required?

no, should go loose pretty easy once you got the 4 screws out, could stick a little due to thermal pad but nothing excessive

[RowanX]

I've unscrewed my gridseed but it won't seem to come apart. Brute force required?

no, should go loose pretty easy once you got the 4 screws out, could stick a little due to thermal pad but nothing excessive

Hmm if the thermal pad is stuck that tight I'm worried that its going to rip some components off the PCB if I apply enough force to seperate it.

[dyland]

will this mod work with hashra controla?

The mod will work for any mining software, you just need to change the chip frequency.

Nervous to attempt, but an extra 100 khsh across 20 miners translates to an extra 2Mhsh. Anyone want to share any best practices aside from OP?

I did the 49.9k mod on all 14 of my gridseeds and I'm glad I did. I'm running CPUminer and all of my chips are stable at 1200mhz and up. The pool and CPUminer and both reporting very close to each other so I'm happy!!

I am having no luck with my 20 modded units running hashra controla on rasp pi. after volt mod, my pool reports almost half of my un-modded previous hashrate 

are you on rasp pi or windows for cpuminer?


I am looking for a plug and play solution for raspberry pi that will work with the 47.7k volt mod.


any ideas from anyone?

[happydaze]

What frequency are you trying to run them at?  I have one with 47.5k and the slowest chip only wants to do 1125MHz other chips will do 1150MHz or 1175MHz.  Setting it all at 1150MHz works ok.

[dyland]

What frequency are you trying to run them at?  I have one with 47.5k and the slowest chip only wants to do 1125MHz other chips will do 1150MHz or 1175MHz.  Setting it all at 1150MHz works ok.

Thanks for the reply; first off, I am running hashra controla on rasp pi, which allows you to set frequency in 50 spot increments across ALL gridseeds.

I was hoping with the voltmod that it would essentially raise the speed limit across all gridseeds, but it does not.

It looks like I am getting only about half of the Mhash I should be getting and I have crazy high rejection rates.


That said I had them all at 1150, and it is paltry compared with where it should be with volt mod. Hashra controla seems to be reporting normally, except for all the rejects, but poolside, yeah, it sucks.

I hear people on this thread running all at 1150 or at 1200 with no problems, so I don't really know where my problem is: 1) the gridseeds 2) the controller 3) the pool, or some combination.