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Topic: GridSeed 5-chip USB miner voltage mod - page 75. (Read 156991 times)

sr. member
Activity: 440
Merit: 250
March 23, 2014, 09:33:05 PM

Actually, the term you're looking for is 'over-volted' not overclocked,,, which they are in fact.
850MHz is 250MHz over the stock - default setting of 600MHz. Wink
One of mine is now overvolted and further overclocked to 900MHz...running rock solid so far.
10 PM tonight will be its first successful 24 hour zero errors benchmark pass! Keep your fingers crossed folks!
Look ma! No fan!  Grin

Wolfey2014

Guess you didnt want to wait anymore and decided to OV some grids huh wolfey?

Glad to see that its working out. Also glad I didnt do diddly to my grids as I've got 4-6 of them that keep crashing and going dead in bfgminer. Stupid things.
hero member
Activity: 826
Merit: 1000
°^°
March 23, 2014, 08:00:49 PM
running 6h now with 950Mhz

cgminer: 404kH
but Pool: 350kH

averages values, yes
legendary
Activity: 1022
Merit: 1004
March 23, 2014, 02:44:23 PM
Haha no of course I don't want to mod it without soldering
I'm asking for a mod which can be easily reversed without DEsoldering,
e.g. jumpers or dip-switches (which don't exist in that dimension I guess)
sr. member
Activity: 378
Merit: 250
March 23, 2014, 02:32:44 PM
0402? That's crazy  Shocked
I don't know if there exist jumpers or DIP switches of that size. Does someone have ideas
on how to do the mod in a nice and easily reversible way (easier then unsoldering)?

No way to do any of it without being able to handle soldering. Sorry.

You can hire me to do it for you, if you want to get it done professionally.

Wolfey2014
sr. member
Activity: 378
Merit: 250
March 23, 2014, 02:30:55 PM
Fan to +5V USB: works!

silent like the usb fans

Yes, I said so in my earlier post last night and today.

And, as an update, it seems to be working stably. No glitching. Wink

Wolfey2014
hero member
Activity: 826
Merit: 1000
°^°
March 23, 2014, 02:27:11 PM
Fan to +5V USB: works!

silent like the usb fans
legendary
Activity: 1022
Merit: 1004
March 23, 2014, 02:17:12 PM
0402? That's crazy  Shocked
I don't know if there exist jumpers or DIP switches of that size. Does someone have ideas
on how to do the mod in a nice and easily reversible way (easier then unsoldering)?
member
Activity: 84
Merit: 10
March 23, 2014, 01:50:35 PM
If I want to use a 0-Ohm resistor or (even better) a jumper instead of just bridging, does someone here know what
would be the right smd-size here? 0805 or 0603? Thanks
maybe even 0403(?) it smaller than the 0603 series i believe.
legendary
Activity: 1022
Merit: 1004
March 23, 2014, 12:45:06 PM
If I want to use a 0-Ohm resistor or (even better) a jumper instead of just bridging, does someone here know what
would be the right smd-size here? 0805 or 0603? Thanks
sr. member
Activity: 378
Merit: 250
March 23, 2014, 11:48:10 AM
There is no 'shorting' the two blue stripes. They show which resistors to draw a pencil lead resistor bridge on to.
Read the modder's instructions.
Short the two yellow stripes.

Wolfey2014

I think he was referring to the page2 image.  The first image (page1) has a single green box, the second image (page2) has two yellow stripes (one of them vertical).

From the response above, if I am running the custom cgminer, I only need to short the two pins shown in the green box in the first post?


Also, please do let us know how your additional mod is holding up today (and any additional details to performing it).

 Huh

Scroll up^ or Hmm.....

Try page 6, this thread, originator is sandor111....

Wolfey2014
newbie
Activity: 27
Merit: 0
March 23, 2014, 11:30:37 AM
There is no 'shorting' the two blue stripes. They show which resistors to draw a pencil lead resistor bridge on to.
Read the modder's instructions.
Short the two yellow stripes.

Wolfey2014

I think he was referring to the page2 image.  The first image (page1) has a single green box, the second image (page2) has two yellow stripes (one of them vertical).

From the response above, if I am running the custom cgminer, I only need to short the two pins shown in the green box in the first post?


Also, please do let us know how your additional mod is holding up today (and any additional details to performing it).
newbie
Activity: 38
Merit: 0
March 23, 2014, 10:49:24 AM
So if I'm right, 10$ a day, you will break even in around 3/4 months depending the price you paid them ?

correct me if I'm wrong

You're close Wink

4.74 months to be more exacter  Roll Eyes

Wolfey2014

you have to factor difficulty increases into your calculation too. you wont be making the same amount in 2 months as you are today
sr. member
Activity: 378
Merit: 250
March 23, 2014, 07:55:27 AM
I noticed there are two pictures of mods, and I was wondering if someone can explain the difference

  • - First mod in first post, single short between the two points in the green box, user modified cgminer, and voltage=1 (and freq to 950+)
  • - Second page has the same picture, with two parts circled (two pairs to short out).


What is the difference between shorting just one pair, vs both pairs?

I am running the modified cgminer (at freq=888 now and stable @ 376kh ~ 20HW errors /day), hanging off a RaspberryPi for the controller.  Would soldering just the first pair work in this case?

Thanks again for posting these mods!
the small vertical bridge of the second mod replaces the cmd parameter and custom miner

There is no 'shorting' the two blue stripes. They show which resistors to draw a pencil lead resistor bridge on to.
Read the modder's instructions.
Short the two yellow stripes.

Wolfey2014
hero member
Activity: 826
Merit: 1000
°^°
March 23, 2014, 07:31:50 AM
I noticed there are two pictures of mods, and I was wondering if someone can explain the difference

  • - First mod in first post, single short between the two points in the green box, user modified cgminer, and voltage=1 (and freq to 950+)
  • - Second page has the same picture, with two parts circled (two pairs to short out).


What is the difference between shorting just one pair, vs both pairs?

I am running the modified cgminer (at freq=888 now and stable @ 376kh ~ 20HW errors /day), hanging off a RaspberryPi for the controller.  Would soldering just the first pair work in this case?

Thanks again for posting these mods!
the small vertical bridge of the second mod replaces the cmd parameter and custom miner
sr. member
Activity: 423
Merit: 250
March 23, 2014, 01:13:19 AM
I noticed there are two pictures of mods, and I was wondering if someone can explain the difference

  • - First mod in first post, single short between the two points in the green box, user modified cgminer, and voltage=1 (and freq to 950+)
  • - Second page has the same picture, with two parts circled (two pairs to short out).


What is the difference between shorting just one pair, vs both pairs?

I am running the modified cgminer (at freq=888 now and stable @ 376kh ~ 20HW errors /day), hanging off a RaspberryPi for the controller.  Would soldering just the first pair work in this case?

Thanks again for posting these mods!

I was going to wait until tomorrow but what the heck....
I decided a couple days ago to go ahead and try modding one of my pods.
I made the first mod which is to jump the two resistors as shown with the yellow stripes. Done deal.
I got a bit better performance out of it @ 900MHz and 950Mhz but still pulled a red nonce every once in a while and at times they would fill the window (cpuminer) for a short birst then go away.
I thought "how strange, what is causing this? Could it be a timing issue?"
Bingo!
The guy who did the mods and had his GS5 running at between 1000 and 1100MHz stable but with a few red nonce's gave me the tip...
I thought, let me try the pencil mod.
So I tried lowering the PLL voltage first to around 1.01V. Seemed to stabilize running at 950MHz so well that I only saw a red nonce every great once in a while over an hour or so of operation where before it was about 3 times as much.
Okay, so changing the resistor was next.
I changed out the 36K for a 38K 5% resistor.
BINGO!

Now I have stable 'no red nonce' operation at 1000MHz!... It's been running stably for over an hour now with ZERO red nonce's! Perfect!
I'm going to let it run overnight and see how things are in the morning. I have a good feeling this is the trick I was looking for.

Thanks to the author of this mod!

I'll save further congrats for later on if I see stable operation over time.
Oh and one other thing. I decided to go ahead and test my theory that lowering the voltage of the cooling fan to 5V was not a good idea due to the usual problems associated with magnetic DC motors.
I guess the drive electronics of DC fan motors has come a long way since I last farted around with them years ago.

I'm driving it with 5V now without any problems so far. Runs just fast enough to keep air moving at a good enough rate to keep the unit cool to the touch! I mean below 90*F. More like 79^ to 81* currently.
And man, it is quiet! Music to my ears! The pod was cooking at 115 to 120*F at 1000MHz which is understandable. That's crankin, for this little bugger!

Not running hotter or pulling more current like I thought it would, at all.
Sorry for scaring some of you guys out of trying it but I guess I get to make up for it by risking burning up my fan etc. Wink
I'll let you know how that went overnight too.
I will also attempt to run it off of the 5V USB power next and see if it screws anything up comm wise or power wise.

It's pulling less than 75mA running. Pulls 140mA start up for a quick second before it calms back down.
I think it would be easy enough for most folks who end up doing this mod, provided mine works out okay, will be able to compensate for the additional load it puts on USB power. But it's a short cut method I really don't recommend in general. One should use a voltage regulator to drop from 12V to 5V. There is more headroom on that rail too in most cases.

Wish me luck!
Wolfey2014

Instead of using a pencil and having to measure any voltages, what resistor can we place there to lower it to 1.01v?

Thanks!
sr. member
Activity: 378
Merit: 250
March 23, 2014, 12:41:13 AM
I noticed there are two pictures of mods, and I was wondering if someone can explain the difference

  • - First mod in first post, single short between the two points in the green box, user modified cgminer, and voltage=1 (and freq to 950+)
  • - Second page has the same picture, with two parts circled (two pairs to short out).


What is the difference between shorting just one pair, vs both pairs?

I am running the modified cgminer (at freq=888 now and stable @ 376kh ~ 20HW errors /day), hanging off a RaspberryPi for the controller.  Would soldering just the first pair work in this case?

Thanks again for posting these mods!

I was going to wait until tomorrow but what the heck....
I decided a couple days ago to go ahead and try modding one of my pods.
I made the first mod which is to jump the two resistors as shown with the yellow stripes. Done deal.
I got a bit better performance out of it @ 900MHz and 950Mhz but still pulled a red nonce every once in a while and at times they would fill the window (cpuminer) for a short birst then go away.
I thought "how strange, what is causing this? Could it be a timing issue?"
Bingo!
The guy who did the mods and had his GS5 running at between 1000 and 1100MHz stable but with a few red nonce's gave me the tip...
I thought, let me try the pencil mod.
So I tried lowering the PLL voltage first to around 1.01V. Seemed to stabilize running at 950MHz so well that I only saw a red nonce every great once in a while over an hour or so of operation where before it was about 3 times as much.
Okay, so changing the resistor was next.
I changed out the 36K for a 38K 5% resistor.
BINGO!

Now I have stable 'no red nonce' operation at 1000MHz!... It's been running stably for over an hour now with ZERO red nonce's! Perfect!
I'm going to let it run overnight and see how things are in the morning. I have a good feeling this is the trick I was looking for.

Thanks to the author of this mod!

I'll save further congrats for later on if I see stable operation over time.
Oh and one other thing. I decided to go ahead and test my theory that lowering the voltage of the cooling fan to 5V was not a good idea due to the usual problems associated with magnetic DC motors.
I guess the drive electronics of DC fan motors has come a long way since I last farted around with them years ago.

I'm driving it with 5V now without any problems so far. Runs just fast enough to keep air moving at a good enough rate to keep the unit cool to the touch! I mean below 90*F. More like 79^ to 81* currently.
And man, it is quiet! Music to my ears! The pod was cooking at 115 to 120*F at 1000MHz which is understandable. That's crankin, for this little bugger!

Not running hotter or pulling more current like I thought it would, at all.
Sorry for scaring some of you guys out of trying it but I guess I get to make up for it by risking burning up my fan etc. Wink
I'll let you know how that went overnight too.
I will also attempt to run it off of the 5V USB power next and see if it screws anything up comm wise or power wise.

It's pulling less than 75mA running. Pulls 140mA start up for a quick second before it calms back down.
I think it would be easy enough for most folks who end up doing this mod, provided mine works out okay, will be able to compensate for the additional load it puts on USB power. But it's a short cut method I really don't recommend in general. One should use a voltage regulator to drop from 12V to 5V. There is more headroom on that rail too in most cases.

Wish me luck!
Wolfey2014
newbie
Activity: 27
Merit: 0
March 23, 2014, 12:01:53 AM
I noticed there are two pictures of mods, and I was wondering if someone can explain the difference

  • - First mod in first post, single short between the two points in the green box, user modified cgminer, and voltage=1 (and freq to 950+)
  • - Second page has the same picture, with two parts circled (two pairs to short out).


What is the difference between shorting just one pair, vs both pairs?

I am running the modified cgminer (at freq=888 now and stable @ 376kh ~ 20HW errors /day), hanging off a RaspberryPi for the controller.  Would soldering just the first pair work in this case?

Thanks again for posting these mods!
sr. member
Activity: 840
Merit: 251
March 22, 2014, 05:52:48 PM
I just got done modding mine I am running at 950 and pulling 404 khs. No hardware errors yet. Thanks to the person that figured this mod out.

Good.
Which mods did you do, exactly?
Just the first two resistor jumpers
or
the resistor replacement to 38K and the 2 pencil mods?

People, please specify exactly which mods you made.
There are a few different ones on here.

Thanks
Wolfey2014

Wolf
I did the 2 jumper mod. Just watching the pool and the miner now but it looks good at 950 so far.

Cool.
Are you watching to make sure there are no red nonce's showing up? Are you sure there are ZERO hardware faults i.e. 0 red nonce's?
Mine ran at 950 but showed a few red nonce's here and there.
I'd rather it ran with none hence, 900. Wink
I am curious to see what the PLL adjustments accomplish, if they work out to be a stable mod.
Thanks
Wolfey2014

I am running Bfgminer and I am showing no errors yet and 404 KHS. The site is reporting no invalids yet either. So far so good.
sr. member
Activity: 378
Merit: 250
March 22, 2014, 03:31:15 PM
I just got done modding mine I am running at 950 and pulling 404 khs. No hardware errors yet. Thanks to the person that figured this mod out.

Good.
Which mods did you do, exactly?
Just the first two resistor jumpers
or
the resistor replacement to 38K and the 2 pencil mods?

People, please specify exactly which mods you made.
There are a few different ones on here.

Thanks
Wolfey2014

Wolf
I did the 2 jumper mod. Just watching the pool and the miner now but it looks good at 950 so far.

Cool.
Are you watching to make sure there are no red nonce's showing up? Are you sure there are ZERO hardware faults i.e. 0 red nonce's?
Mine ran at 950 but showed a few red nonce's here and there.
I'd rather it ran with none hence, 900. Wink
I am curious to see what the PLL adjustments accomplish, if they work out to be a stable mod.
Thanks
Wolfey2014
sr. member
Activity: 840
Merit: 251
March 22, 2014, 03:25:08 PM
I just got done modding mine I am running at 950 and pulling 404 khs. No hardware errors yet. Thanks to the person that figured this mod out.

Good.
Which mods did you do, exactly?
Just the first two resistor jumpers
or
the resistor replacement to 38K and the 2 pencil mods?

People, please specify exactly which mods you made.
There are a few different ones on here.

Thanks
Wolfey2014

Wolf
I did the 2 jumper mod. Just watching the pool and the miner now but it looks good at 950 so far.
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