Topic: GridSeed 5-chip USB miner voltage mod - page 80. (Read 156991 times)

found thius in the geedseed specs for the gc3355 chip

Power and Ground

6.3 Operation Condition
PARAMETER MIN TYP MAX UNIT
Core Supply Power 0.7 1.0 1.2 V
PLL Supply Power 0.9 1.0 1.1 V
IO Supply Power 2.5 3.3 3.6 V
Operating Temperature -20 25 85 ℃
DVDD Operation Current 5000 mA
Power Consumption 5000 mW

and also this

6 ELECTRICAL CHARACTERISTICS
6.1 Crystal and Oscillator
PARAMETER MIN TYP MAX UNIT
Clock Period 40 ns
Clock Frequency 25 50 MHz
Clock Duty Cycle 45 50 55 %
Clock Jitter 50 ps

so the clock speed/cystal has 50% haed room and there is about 10-20 % headroom on the voltages. yet to find the actually spec for some of the other chips though.

I'm starting to like CGminer more and more
I'm holding off on the over-volt / over-current mods for a while yet to see what happens to the ones who do.
Getting positive results on the profit end is a good thing but, is it temporary or is it permanent? Will the uP's take it indefinitely or will they fail prematurely at some point? Only time will tell.
Wolfey2014

Want to offer this if anyone is interested.

I have moded 8 units so far and they have been flawless. Running between 404 to 420khash depending on chip quality.

If anyone is looking for someone to mod their gridseeds for them, I could do it. PM me with how many units you need done and I'll send an estimate back. Not looking to make much - just to cover my time and risk. Also please make sure you have the gold unit with an ST32 USB controller. If I make a horrible mistake and brick your Gridseed, I will replace with one from my own farm.

Obviously, the firmware won't help you or anyone else who doesn't own (like me) or want to use their controllers, for what ever reason.
It is however, an option for those who do.

If you want to risk the possibility of causing pre-mature failure, or worse of your miner's uP's, go ahead. No one is stopping you.
For me, I'm leaving the results to be had by those who are doing the actual experimentation right now. They're taking all the risks which is fine with me.
If I see that the hardware mods work stably over time, say a few weeks to a few months, I will then venture into doing the same over-volt mods.

It's up to each and ever individual to decide what they want to do with their miner's. No one is trying to 'tell' anyone what to do either way.

Chill! Have fun!

Peace
Wolfey2014

Well, that's a given, isn't it.....

No one has proven yet, fully stable operation via such hardware mods. They are tinkering with possible disaster. No telling how much such over-volting and additional current is going to be tolerated by the uP's nor for how long before they take a powder...

The firmware upgrade has been tested and proven over a long period of time by experts who would know a lot more about 'their' hashers than any of us do!

But, you go ahead. Have at it. I'm going to wait and see what happens to the bold pioneering experimenters rigs over a period of time longer than hours or days before I make any such hardware mods.

But, You go right ahead!

Wolfey2014

I have a very low watt (15) asus laptop with win8, I also plan to use 4 or 5 miners.

So one good powered hub hooked up to the pc with the GS's on there will be fine I guess?

( my questions may sound stupid to the "pro's" but yes I'm a total novice in this )

so what are you running all these on? just connected to powered usb hubs and then on a pi? or a pc?

Yeah, the two controllers I have suck. Like I said, I dont even know what they are.... They are bare boards and use some mini SD card or something. All I know is I hate them.

I am so happy to get rid of the controllers.  I had digital timers turning the power off every 2 hours for 1 minute to reset all the miners.  CGminer has been flawless so far.  Time to start soldering.

Hey just a little question, how much watt solder iron is ok to use to make the bridge, I have a very thin iron but it's 40w ?

I want to put a little on the tip of the iron and just gently put some lead between points to make the bridge

thanks

Nor will it help those of us that dont use controllers. I dont even know what the hell the two controllers I have are supposed to be. Web interface is full of chinese and they make zero sense to me. 

Firmware for some "controller" is not going to negate raising the core voltage with a hardware mod to obtain faster stable clock speeds.

you can solder the fan + to VCC of the micro USB port
but assure to have a external powered hub if you use more than one

Hahahahahahahahhaahahahahah!
Frikkin hilarious!   

How ever, you may want to try this first as there may end up being no need for any hardware mods.

*****************************
HASHRA TO THE RESCUE!
I have been authorized by HASHRA to announce....

New firmware for our controllers.
Could these be the ultimate cure for our hash configuration woes?
No more pissin around with tweak this, config that, change this, debug that....ahhhhhhhhhhhhhhh!

Ladies and Gentlemen! I present 'our saviors'!
Get your FREE firmware upgrades here! http://hashra.com/support/

A little background via direct quote:

"Our firmware "HASHRA CONTROLA" can be found here… hashra.com/support.

It is based on CGMiner and we have also made all the source code public on our GitHub page, please feel free to spread the word about it.

We were really aiming to create something that was stable, not just blast a whole load of hashing power if it keeps restarting etc.

We are happy with what we have so far though it is still in continuous development.
We plan to use this as the basis for our future products coming up and is designed for the Raspberry Pi.

At present you can use it to mine SHA or SCRYPT though we are still working on the dual aspect… it is proving tricky but we are getting close to having it now stable… to get it you will just need to hit update firmware and it will update straight away.

Using our firmware we recommend core speed at 850… should sit at just over 3.6MH for 10 units with no issues."

Let me/us all know how it works out. I don't own a controller yet but,,,soon!
I want to let all the bugs get worked out, then decide on which is the least hackable, least attackable and most stable controller out there.

Peace on Earth folks!
Wolfey2014

Wolfey2014

Dammit.  This is going to take me forever to solder.

LOL!

I'm running in scrypt only. I didnt much care for the loss of scrypt hashing power when running in dual mode.

I'm far from setting anything ablaze but thanks for looking out for me.

Listen, you guys are playing with fire.
Stop before you fugg something up!
Adding .25A (250mA) to the 5V USB rail is suicide if you are running more than 2 GS units off of the same USB port power/hub. Actually, if you drop a 12V fan to 5V, the current draw will increase accordingly and without calculating the load change I'd guess an increase to 500mA or as high as 750mA. Death for the fan motor and USB bridge/hub and possibly your comm port power source not to mention totally messed up data throughput!
If you are only running Scrypt, just disconnect the fan! No need for it in Scrypt only mode.
If you are running sha/scrypt or just sha, leave the fan the way it is.
If the noise bothers you that much, either replace it with a quieter fan or put the miners in another room
away from you so you don't hear them!
Geesh!
W2014

On the first two Grids that I unboxed I made a 4 pin hard drive molex to 2.1mm barrel plug adapter to provide +12 to the miners. I also ran the ground and +5 wires from that molex to the fans and they ran great. Perfectly quiet but enough air to keep the grids cool (which were running in dual mode at the time).

I didn't think of using a resistor or the USB voltage. Both are good ideas as it keeps the miners appearance nice and clean with no extra wires or parts floating about.

What about the 5V from the USB?

Edit: I wonder if 5V would be enough though...  I've used a series resister on fans before. You just need to use one that will handle the current.

I suppose your right. I thought of using a TO-220 7805 but I dont really want to add more crap to the thing. I figured a 5 VDC zener would cut that passing voltage enough to slow the fan down but, who knows.... The diode would have been nice and clean being inline with the wires too.