GridSeed 5-chip USB miner voltage mod

[simon66]

Oh man that blogs.
Copy pasted nearly the whole thread ,without naming anyone who helped developing it.
http://cryptomining-blog.com/1839-another-new-voltmod-update-for-the-gridseed-5-chip-btcltc-asic-miners/#comment-759

That blog is a joke. Even if it was "jamie", they didn't even cite her.

Also, Everyone is saying to use a 47kOhm resistor. Can I use a 56kOhm at 1100mhz? Does it need to be 1/4W or 1/8W? I mean, I know I can increase the mhz but will it be good at 1100mhz?

Thanks nemercry!

[Reggie0]

Oh man that blogs.
Copy pasted nearly the whole thread ,without naming anyone who helped developing it.
http://cryptomining-blog.com/1839-another-new-voltmod-update-for-the-gridseed-5-chip-btcltc-asic-miners/#comment-759

That blog is a joke. Even if it was "jamie", they didn't even cite her.

Also, Everyone is saying to use a 47kOhm resistor. Can I use a 56kOhm at 1100mhz? Does it need to be 1/4W or 1/8W? I mean, I know I can increase the mhz but will it be good at 1100mhz?

Thanks nemercry!

You can use, but you will have extra power consumption and heat dissipation. Always use the smallest sufficient resistor(voltage) to achieve the highest efficiency at a selected frequency.

[CartmanSPC]

Anyone check to see what affect this mod does to SHA mining?

[DarkKnight]

Anyone check to see what affect this mod does to SHA mining?

With this mod, 7w only mode is using close to 40w? I'd guess that if you try running SHA256 Mode, might as well just toss it in the trash. 

[nemercry]

Anyone check to see what affect this mod does to SHA mining?

I am also pretty sure that your board will just burn or just turn off.

Oh man that blogs.
Copy pasted nearly the whole thread ,without naming anyone who helped developing it.
http://cryptomining-blog.com/1839-another-new-voltmod-update-for-the-gridseed-5-chip-btcltc-asic-miners/#comment-759

That blog is a joke. Even if it was "jamie", they didn't even cite her.

Also, Everyone is saying to use a 47kOhm resistor. Can I use a 56kOhm at 1100mhz? Does it need to be 1/4W or 1/8W? I mean, I know I can increase the mhz but will it be good at 1100mhz?

Thanks nemercry!

Like reggie0 said, only try to go lower.
With an 47kOhm 1%(the one percentage is important) and some thermal paste(non conductive only) i am pretty sure that you get stable 1150mhz on all devices.

[simon66]

Anyone check to see what affect this mod does to SHA mining?

I am also pretty sure that your board will just burn or just turn off.

Oh man that blogs.
Copy pasted nearly the whole thread ,without naming anyone who helped developing it.
http://cryptomining-blog.com/1839-another-new-voltmod-update-for-the-gridseed-5-chip-btcltc-asic-miners/#comment-759

That blog is a joke. Even if it was "jamie", they didn't even cite her.

Also, Everyone is saying to use a 47kOhm resistor. Can I use a 56kOhm at 1100mhz? Does it need to be 1/4W or 1/8W? I mean, I know I can increase the mhz but will it be good at 1100mhz?

Thanks nemercry!

Like reggie0 said, only try to go lower.
With an 47kOhm 1%(the one percentage is important) and some thermal paste(non conductive only) i am pretty sure that you get stable 1150mhz on all devices.

Why do people pretty much LOVE artic silver 5? That is conductive but dissipate heat better? Thanks.

Also, I'm about to get a 1/8W %1 resistor.

http://www.digikey.ca/product-search/en?pv1=1062&FV=fff40001%2Cfff800e9%2Cc0001%2C400004&k=resisotr&mnonly=0&newproducts=0&ColumnSort=0&page=1&quantity=0&ptm=0&fid=0&pageSize=25

thats the list, and I'm getting this one

http://www.digikey.ca/product-detail/en/CRCW040247K0FKEDHP/541-47.0KYCT-ND/2223047

Would this work. I've used resistors before but I never really cared much about the 1/4W or 1/8W (EE is just a hobby lol)

[amix]

vid0	vid1	W	R (K)
0	0	12.4	33
0	1	10.4	30
1	0	11.2	27
1	1	14.0	36

47kOhm 1% gives you stable 1100mhz to 1150mhz range 21,5 W Powerdraw including PSU
52kOhm 1% gives you stable 1200mhz 31W including PSU
56kOhm 1% gives you stable 1250mhz 44W including PSU

86kOhm 1% draw way to much and did turn off the device instantly (onboard powersupply is not rated for > 60W) we assumed it to take around 80W.
If you are funny you can try to use an 64kOhms resistor and you will probably get the highest possible frequency of 1300mhz.

you power usage seem to be WAY off or are we talking mulitpe grid here?

ive just tested my grid - pre mod - running at 850mhz, and it showed a draw of 0.6A.
so
Watts = V . A
         12 * 0.6
    = 7.2 Watts - pretty close to the 7w spec given by gridseed. oh that with the stock 33k ohm resistor - NOT 12.4 wat.

i really dont see increase the resistor to 56k producing a 44w draw per unit. thats a heck of a jump for a few milli volts. whats the voltage increased to 1.28? 1.3v?

So please check your calcs check your measure and report on single unit etc.
(mine was take using digital mulitmeter set in series to my grid - consume modified molex adaptor just for measuring the amps with my meter)

And anyone still using the orignal power supply that came with it BIN IT!!!!!! i came home the other day and my flat was without power fusebox tripped. turned out the gridseed power supply origanl had tripped the fuse. everything now runs off an old computer PSU.

[amix]

[

Like reggie0 said, only try to go lower.
With an 47kOhm 1%(the one percentage is important) and some thermal paste(non conductive only) i am pretty sure that you get stable 1150mhz on all devices.

it aint that important. 56k at 1% gives a 560 tolerence cool 56k +- 560 ohms not bad for a price.
56k at 5% gives a 2.8k tolerance. ie 56k +- 2.8k ok not as good but it depends on how tight you want yor voltage to be, plus you can always check it before using it. then stress it A BIT and check it again see the resistance falls within your range. yes 1% is better but its not crictal. plus 5% at certain ranges are a lot easier to get hold off, price difference is nothing, they can be harder to find that all. And seriuosly you think theese things made in china was all produced using 1% resistors? you really believe that looking at the build quality? exactly.

if you can gt hold of 5% use it just bear in mind the tolerence. 56k might be pushing the limits of it that extra 2.8k could break thoose limits. just be aware of the parts your using and there limits and tolerance!!!
and lower values it obviuos less ie 10k would be +- 500 ohms!

[jamieb81]

vid0	vid1	W	R (K)
0	0	12.4	33
0	1	10.4	30
1	0	11.2	27
1	1	14.0	36

47kOhm 1% gives you stable 1100mhz to 1150mhz range 21,5 W Powerdraw including PSU
52kOhm 1% gives you stable 1200mhz 31W including PSU
56kOhm 1% gives you stable 1250mhz 44W including PSU

86kOhm 1% draw way to much and did turn off the device instantly (onboard powersupply is not rated for > 60W) we assumed it to take around 80W.
If you are funny you can try to use an 64kOhms resistor and you will probably get the highest possible frequency of 1300mhz.

you power usage seem to be WAY off or are we talking mulitpe grid here?

ive just tested my grid - pre mod - running at 850mhz, and it showed a draw of 0.6A.
so
Watts = V . A
         12 * 0.6
    = 7.2 Watts - pretty close to the 7w spec given by gridseed. oh that with the stock 33k ohm resistor - NOT 12.4 wat.

i really dont see increase the resistor to 56k producing a 44w draw per unit. thats a heck of a jump for a few milli volts. whats the voltage increased to 1.28? 1.3v?

So please check your calcs check your measure and report on single unit etc.
(mine was take using digital mulitmeter set in series to my grid - consume modified molex adaptor just for measuring the amps with my meter)

And anyone still using the orignal power supply that came with it BIN IT!!!!!! i came home the other day and my flat was without power fusebox tripped. turned out the gridseed power supply origanl had tripped the fuse. everything now runs off an old computer PSU.

Well I saw that they also did the the test on : http://cryptomining-blog.com/1839-another-new-voltmod-update-for-the-gridseed-5-chip-btcltc-asic-miners/

and they also show 20w

[ajareselde]

is there another connection point for r52 resistor. cant solder to that point closer to outside, so, is there some other connection point for it?

[jamieb81]

so you did not solder between the two connection points of the SMD that you replaced.

what's that other point you took to solder the resistor on?

[wolfey2014]

so you did not solder between the two connection points of the SMD that you replaced.

what's that other point you took to solder the resistor on?

It's the test point that is connected to the rear (not inner) most solder point of the SMD chip.
It's easier to solder it there than otherwise although I can easily do it that way too.
It's optional, if you must use the original solder points. Electrically, they are the same connection.

[jamieb81]

so you did not solder between the two connection points of the SMD that you replaced.

what's that other point you took to solder the resistor on?

It's the test point that is connected to the rear (not inner) most solder point of the SMD chip.
It's easier to solder it there than otherwise although I can easily do it that way too.
It's optional, if you must use the original solder points. Electrically, they are the same connection.

Ok I see, it seems actually much more easy like this, having more space between the points, more space to use the solder iron

[bon4ire]

so you did not solder between the two connection points of the SMD that you replaced.

what's that other point you took to solder the resistor on?

It's the test point that is connected to the rear (not inner) most solder point of the SMD chip.
It's easier to solder it there than otherwise although I can easily do it that way too.
It's optional, if you must use the original solder points. Electrically, they are the same connection.

What's the new default wattage after the mod?

[wolfey2014]

so you did not solder between the two connection points of the SMD that you replaced.

what's that other point you took to solder the resistor on?

It's the test point that is connected to the rear (not inner) most solder point of the SMD chip.
It's easier to solder it there than otherwise although I can easily do it that way too.
It's optional, if you must use the original solder points. Electrically, they are the same connection.

What's the new default wattage after the mod?

Here are some figures I came up with while load testing my modded pods.

49.9k mod
690mA idle
1390mA 1125MHz 19.18W + 3.90W 5V Fan = 22.94W 503KHs to 671KHs 
1410mA 1150MHz 19.32W + 3.90W 5V Fan = 23.22W
1420mA 1163MHz 19.59W + 3.90W 5V Fan = 23.49W
1460mA 1200MHz 20.14W + 3.90W 5V Fan = 24.04W
1480mA 1225MHz 20.42W + 3.90W 5V Fan = 24.32W 503KHs to 721KHs
These figures do not include power supply current suckage.

One other thing I noticed. These things won't quit sucking power after quitting the mining program. They just keep sucking the same level of current as if they were actually mining.
They have to be hard reset by re-powering the 12V rail. At least in cpuminer they have to be.
Has anyone else noticed this running cgminer or bfgminer?
I looked at all the minerd commands that are available but none of them cause a power cycle or reset.
That sucks! 

[sang]

Can someone post details/pictures of the 5v fan mod? Is there another point to solder the fan leads to? Is it dangerous in any way (dangerous in terms of load to the newly utilized power circuit)?

[rob1313]

Hi, Im looking for some one in Wi to perform some of these modifications. Please Pm me. sorry wolfey2014 but shipping the units to you i don't think would be cost efficient but please send me a pm if you wish to discuss.

[wolfey2014]

Can someone post details/pictures of the 5v fan mod? Is there another point to solder the fan leads to? Is it dangerous in any way (dangerous in terms of load to the newly utilized power circuit)?

READ!!!!!
page 5, 6, 12, 14 and so on. It's all written up and described!

[ZiG]

Can someone post details/pictures of the 5v fan mod? Is there another point to solder the fan leads to? Is it dangerous in any way (dangerous in terms of load to the newly utilized power circuit)?

Speaking of Fan mod...for silent operation...:

With all my due respect to Wolfey's solution...There is another "Classic Silent fan" solution from the CPU overclocking experience...7V fan driving...between 12V and 5V power lines...

How...: Disconnect the GROUND/BLACK wire from the original position...and solder back to the 5V regulator uP1707 output...this is the small / medium size 8-pin chip to the left of the 12V PS supply connector...the easiest point to connect are to the big output SMD caps to the right of the IC...C201/C203...their pins towards the center of the board...facing the square inductor close to them...this is 5V output supply...uP1707 is rated for up to 3A...so the current load of the fan should not have any effect on the circuit...

Mine is running whisper quiet @ 6.69V...11.82V - 5.13V ...

IMHO this is better solution ...because of the higher voltage...better performance/cooling...but still silent/no noise...not creating ANY load to 5V USB supply, preventing possible issues with USB hub(s) with many Gridseeds...not having enough juice...etc...

As usual...try at your own risk...

Cheers,

ZiG  


P.S. I am assuming that everybody, interested in these mods, has already PDF schematics of the 5-chip Gridseed device from...:  https://github.com/gridseed/usb-miner/tree/master/hardware

[volum4]

@ZiG

You mean something like this? :
https://i.imgur.com/t5Rp2tC.jpg?1