Topic: GridSeed 5-chip USB miner voltage mod - page 55. (Read 157001 times)

Nice! Could be just me but running it a 1163 instead of 1160 is running much much smoother. I thought the clock rates increase by 25Mhz. Either way, after 4 hours I only have 50HW. Will try these new values.

Thanks!

HashFire,
the mod you performed has been cancelled and replaced with the mod on this page,
https://bitcointalksearch.org/topic/m.6098563
The current mod with the jumpers was only able to achieve maybe 1050MHz but with several HW errors/red-nonces.
The latest mod is the best one and it is able to allow up to 1200MHz stable although I have found that 1100 to 1175 is the sweet spot, so to speak.
You need to make the change to the latest mod and this may solve your problems.
Please let me know how it goes.
Feel free to PM me if you need more help!

I successfully did the the soldering mod by bridging the 2 gaps with some 30 gauge wire, and the 5V Fan mod. I am running 12 on a Raspberry Pi using the Hashra image (V1.3.3).  At 850mhz everything works, I have one GS that is really slow to get shares though.  Over the past 11 hours, All theo ther units have gotten about 3200-3300 shares.  This problematic one has only 125.  At 900mhz or 950mhz it and one other unit report as running but wont accept any shares. 

Any ideas why this is happening?  I am kind of unsure how to even figure out which unit this is physically since I don't know where numbering starts on the USB hub or how the Hashra image assigns it. 

250, 400, 450, 500, 550, 600, 650, 700, 706, 713, 719, 725, 731, 738, 744, 750,
756, 763, 769, 775, 781, 788, 794, 800, 813, 825, 838, 850, 863, 875, 888, 900,
913, 925, 938, 950, 963, 975, 988, 1000, 1013, 1025, 1038, 1050, 1063, 1075, 1088,
1100, 1113, 1125, 1138, 1150, 1163, 1175, 1188, 1200, 1213, 1225, 1238, 1250, 1263,
1275, 1288, 1300, 1313, 1325, 1338, 1350, 1363, 1375, 1388, 1400.


Is that the one you are looking for?

I've put a notepad in my CPUminer folder right away so that I could have quick access to it hehe

Can someone point me to the page/thread that has the Gridseed 5 chip overclock frequency chart on it?
You know, the one that lists all the different frequencies from 450MHz up to 1400Mhz...
I can't seem to find it, easily..... ;(
Thanks

Simon, this is not unusual. Some pods work better than others do, evidently.
Please try 1125 then lower until it stabilizes.
Let me know how you do with this.

I wonder, why do you not a higher frequency, I've just received mine and stock at 850 running fine getting about 350Kh out of it I haven't tried

higer freq yet?

Thanks for the update anyway

I'll post some results when I modded mine as well.

I'm using a PC PSU and better quality usb cable, the stock ones are really thin and short.

CPUminer works real easy, real noob proof, using the latest version with fine tuning the freq.

I'll maybe give BFGminer a try soon as it uses the same drivers.


I have unchecked the fifo buffer under windows8 and all seems fine for now.

+1 ...I second this...

Specially Wolfey2014...Could you stop your very annoying ads...as well as trying to impose your opinion(s) on others...like "Do this...Don't do that...etc"

Enough is enough, buddy...

Hi all!
Just wanted to tell you of my experience in doing this voltmod.

I currently have 4 Gridseeds with the 5V fan mod running bfgminer on minepeon on a raspberry pi. From day 1 I did the original resistor mod and found 3 of them to run at 950mhz fine with no HW errors but one of them just didn't want to play nice. I ended up running that at 850mhz.

I then tried doing the 36k -> 38k resistor mod and pencil mod to the gridseed that wasn't playing nice. Found that this didn't really make a difference and I kept it at 850mhz as any higher would produce some HW errors.

Just last night I decided to do the new resistor mod. I resoldered the 36k resistor back, unsolderbridged the original resistor mod, rubbed out the pencil mod and followed the guide to solder at 39k 1/8 w resistor to r52.

This raised the voltage from 1.15v to 1.37v measured across r52 and the gridseed runs stable at 950mhz with no hw errors. I'll be replacing the resistor with smds when they arrive.

The original 3 gridseeds that ran fine at 950mhz consumed about 7w of power whereas the new gridseed with the new voltmod runs at about 10.5w. For reference, the fans used approx 1.5-2w of power.

Edit:
Forgot to include hashing rate stats!
about 12 hours up time:
the original 3 running at 950mhz hash at 404kh/s with an effective rate (calculation includes rejects and hw errors. Column 3 of bfgminer) of about 380kh/s on avg
the single newly voltmodded one running at 950mhz is hashing at 388kh/s (not sure why its reporting so low compared to others) and an effective rate of about 400kh/s

I want to thank everyone in this thread for all the information about the overclocking of these devices =D

If anyone have any questions feel free to pm me. I'm located in Australia so my timezone in out of sync with all you northerners =P (winter is coming.... )

Please do try to keep this on-topic.

Yes it ran stable up to 900Mhz before the mod. Now with the mod, 900Mhz works fine too (as expected), but at 1150Mhz it doesn't work that well. I got the Golden units.

So you're saying it RAN fine at 850 / 900MHz WITH OUT the mod?
Did you test it before you did the mod? This is very important!
If it was unstable in the first place, then the mod may not work or might make the results worse!
Please be clear and concise in your answers. I cannot help you without the specific exact data I am requesting.

It runs fine with no HW at 900Mhz and 850Mhz. I haven't tried 1000 or anything in between that and 1100.

Nope, that's it. Was your miner stable at 850MHz with little to no HW errors before you did the mod?
Your soldering job doesn't look at clean or intact as it could be. Perhaps that might be what's causing your problem?
Sorry I can't be of more help!

All the mod I did on mine was the 49.9K resistor. Thats all. Is there any other mod I need to do?

Thanks!

Thanks, but P2P you need +1200MH to work good if I'm correct, I dont have yet enough MH :p

You could have used my ref link hehe

BC I'm a long time follower of that coin, tried the pool Friday but it was not a good payout, they said they made it better, let me know
cause Friday I rented a rig with 5MH and got paid less than 100BC

Simon, is your pod over volt modded?
If not, 1150 will produce tons of HW errors and waste energy big time!
The stock heat pads work just fine with proper placement and torquing of the hold down screws.

doge.wannamine.com works great!
Also, I'm trying out www.blackcoinpool.com
and I now belong to PMB Mining - http://pbmining.com?ref=btcmkr
It's a great place to put your btc to work making good money instead of just sitting doing nothing!
Good luck!

1150Mhz has been giving me HW errors. I'm so sure why I'm getting 50 HW and A:650. Prob due to heat? I'll try to apply non-conductive thermal paste and see if I can bring these down.