Topic: GridSeed 5-chip USB miner voltage mod - page 64. (Read 156991 times)

Okay, my 'non-pencil-trick' mod is:
Replace C36 10nf with a 100nf capacitor = no more pencil tricks! 'yay'
This includes the other 3 mods i.e. the two jumpers and resistor change out on page 14 (Sandor's mods) of this thread.
I have run over 36 hours with ZERO hardware errors - 1000MHz (stable) at 568KH/s peak - 378KH/s average pool side .07% stale shares out of 587,114 valid shares. Comm port FIFO's were set at 14 Receive and 16 Transmit.
It's still running strong and stable. So I believe this mod is a pass!

I"m looking forward to trying out nemercry's mods when he finally releases the particulars. His results sound fantastic!

As usual, if you do these mods, you do them at your own risk!

Give me a little more time and ill give you a run of my 1250mhz and of my 1150mhz units. 24h each. I was able to setup a headless machine now and can let them run 24/7 now.
Probably i'll get a higher stable rate. Lets see

28W is only GS's power consumption without fan.
The second picture is for win sandor's 0.6 BTC reward. You can see less than 10 HW errors in 24 hour. It is the same mod, only freq was reduced.

BTC: 1gqdzx8iSwUGt3vaoEaPCjvrWo7zKn7PK

Stable 510kH/s@1200MHz mod of Reggie0, _only_ by replacing R52 with 100k Resistor and C32 with 120k? On the first view this sounds good!
@Reggie0: You've said GS takes 28W, do you have measured only the GS with fan or including the power supply?
Additionally I'm a bit confused. Here you talk about 510kH/s:
https://bitcointalksearch.org/topic/m.5954771
But later, when it comes to proof stability you screenshot talks about 473kH/s
https://bitcointalksearch.org/topic/m.5971887
Are we talking about different mods?

@nemercy: What are your modifications to get 489kH/s@1150MHz stable? It consumes 21W (with fan and PSU) you wrote, so I think its maybe the better choice.

I have done the 3 mods on 2 of my pods and seen some benefit locally and pool side.  I do find that the choice of pool for testing is important as these multi-coin pools really have poor stratum results.  They toss all different kinds of rejected shares upon switching coins.  I would suggest for testing mod stability to use a sole coin pool as that has given me better numbers.  

Currently running at 1050Mhz stable and I do not have the PLL down to 0.94 yet. Looks like there is more room in these units.

I have done the 3 mods on 2 of my pods and seen some benefit locally and pool side.  I do find that the choice of pool for testing is important as these multi-coin pools really have poor stratum results.  They toss all different kinds of rejected shares upon switching coins.  I would suggest for testing mod stability to use a sole coin pool as that has given me better numbers. 

Currently running at 1050Mhz stable and I do not have the PLL down to 0.94 yet. Looks like there is more room in these units.

please don't post this hashra shit here! it's just another spam.. it has nothing to do with voltage mod.

i believe R336, R46, R212 are all 0402? also it is very hard to find 14.7k and 27.4k where i live. closest i could find is 15k and 27K. will the performance will very much?

If I wanted to run mine at 1150 stable, which resistor values should I use on R46 and R212?  I appreciate your picture and the risk you put in finding this mod.

@Mixdio:
Could you explain me which benefit i'll get when i give it a higher PLL voltage ?
Doesnt make sense for me to higher the voltage there ?
Would be nice if you can help me on that here.

Some tuning news on Gridseeds (Scrypt Mining)

1.) Tuning of Gridseed Hardware (Soldering required) upto 436 KH/s per Miner
2.) Fork from CGMiner for Gridseed Hardware (Frequency per Miner, Easy Overclocking for more stable Miners)

http://gridseed-blog.com (contains link to Originalpost, BLOG about Gridseed Mining is currently created)

So that's what's been mystifying us all - lost 'Completed Work' which is caused by a False Negative, of which the GS isn't programmed to detect and flag or display in the print out?
It just goes un-noticed in real time locally - then one sees the result pool side which ends up as Stale Shares or just No Shares of any kind reported at all.
Lost Completed Work = Lost Money = Throwing Coin Away!....Pssssshhhhhhhhhhhhhhhhh!
Is this correct?

Still, I see my Reward$ caufers filling up nearly twice as fast as before I made the mods.
Something still isn't being caught or explained here. Maybe I'm just hallucinating!
Better explanation. But the complete 'why' still eludes, I fear.

I wonder if an oscilloscope connected to the right spots on the card will give a better if not the indication of what's going on and even tell one when they've hit the real 'sweet spot' and not go any further. That would be some serious fine tuning. I happen to have a CRO. I guess I'm going to have to start probing and see what I can find out.

Or, is it all calculable (math) and the end result of the equations ARE the REAL answer and THAT"S THAT no matter what hardware changes are made or probing is done?

False Positive's SUCK!  

But....

The fact is, the original 4 mods have caused hardly any increase in power consumption while having reduced if not negated and stabilized an otherwise very unstable 'red noncey' stock miner at 850MHz or higher clock rate. So at this point, I still believe the original 4 mods are beneficial. I still want to circumvent the pencil mod without losing its positive results and I may have achieved this already. Still testing.

The thing is to get the clock and resulting counting / calculations in the chips to be stable and positive at higher clock rates so as to produce more valid shares i.e. $Moolah$! at the pool. I still believe this is achievable and we're on the right track.

All in the name of progress....right?  

Wolfey2014

Sorry to disappoint, but that's not yet stable by my standards, which is less than 10 HW error in 24h. But obviously the highest stable frequency wins, so it will be you if you manage to get it stable...
Now that, folks, is called pushing it to the limit, great work mate.