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Topic: GRIDSEED G-BLADE Overclocking 7Mh/s, improvements and repair - page 26. (Read 74155 times)

hero member
Activity: 840
Merit: 1000
Stock is 1,2V and Bridge does 1,3V ; both ±0.5V

CGminer voltage=1 works and sets 1.32V on mine



1HW error per minute on the first one looks high to me.

Can you check if by chance it is the top pcb that is giving more errors ?
Slight overheat of the chip on the upper board gives higher error count for me.
hero member
Activity: 826
Merit: 1000
°^°
afaik they only have 2 voltage reference lines
legendary
Activity: 2450
Merit: 1002
could not clock it to over 900, though

"registers write failed: incompatible firmware"

Ah bummer, well maybe its not even worth it, mine already run @ 850 / 863mhz fairly stable. Is voltage=1 the only setting or is voltage=1 changeable to a different number?
hero member
Activity: 826
Merit: 1000
°^°
could not clock it to over 900, though

"registers write failed: incompatible firmware"
hero member
Activity: 826
Merit: 1000
°^°
FETs are between 40°-50°C on 900Mhz

on the pic in post#117:
top one: permanent VID=1
bottom one: the voltmod
legendary
Activity: 2450
Merit: 1002
Stock is 1,2V and Bridge does 1,3V ; both ±0.5V

CGminer voltage=1 works and sets 1.32V on mine

Does this .01 increase require component upgrades or just heatsinks on the fets / VRM areas?
And also, which one gets the bridge to allow voltage=1 in software? rather than both for locking it in on hardware.

What are ur hashrate / clock results w/ this mod?
hero member
Activity: 826
Merit: 1000
°^°
Stock is 1,2V and Bridge does 1,3V ; both ±0.5V

CGminer voltage=1 works and sets 1.32V on mine

newbie
Activity: 5
Merit: 0
Can me tell anyone what is capacity on C 217 ??
legendary
Activity: 2450
Merit: 1002
So, the bridgemod ... would only bridging one of the resistor still allow voltage=1 to work w/ mining software? Thats what seems to be the case in the little guide on the smaller gridseeds.
Also, in doing the bridgemod, what voltage does this run the ASICs at?
Whats stock voltage again?
sr. member
Activity: 378
Merit: 250
Nice work J4! I'm impressed!
So, have you decided if your rig is fully overclocked now? No more head room left?
Again, very well done!
Wolfey2014
sr. member
Activity: 412
Merit: 250
ok thank you, are they enough for cooling or they are really hot, like on the edge?
You get now from one blade like 7,2 Mhash?

I will try this as soon as I get thermal glue
hero member
Activity: 840
Merit: 1000
Ok for now you have just replaced resistor 33k for which one?
Let us know when you changed mosfets.
you didn't put coolers on Q6 to Q8?

33k replaced with 43k

you can see small dissipators on top of Q6 Q7 Q8 on the upper right corner of the third picture.
plus larger ones on the back side of the pcb under the mosfets and choke
sr. member
Activity: 412
Merit: 250
Ok for now you have just replaced resistor 33k for which one?
Let us know when you changed mosfets.
you didn't put coolers on Q6 to Q8?
hero member
Activity: 840
Merit: 1000
as promised, some more pics

The blade in action with the prototype cover




cover removed




the cooling of the chips.




closer view of both pcb modded
I used the secondary location on one of the boards because my 0805 resistor was keeping shorting with the nearest empty pad.
still needs some cleaning of the pads on this one




on the second board, the resistor is just where the 0603 33K was




and in case you want to try the bridge voltmod, here are the places to connect for pin 12 and pin 13 of up1509.
As usual, you do it at your own expense.
Beware you can fry your blade.




sr. member
Activity: 412
Merit: 250
looking for good replacements of FB29 and FB30 , any suggestions ?
use regular one
member
Activity: 145
Merit: 10
looking for good replacements of FB29 and FB30 , any suggestions ?
sr. member
Activity: 412
Merit: 250
I see that replacament should work 7004 have much more ampers.
But didn't find 5002
sorry, IRFH5302 on my board
Thanks I already check it, I don't have board at home Smiley
hero member
Activity: 840
Merit: 1000
I see that replacament should work 7004 have much more ampers.
But didn't find 5002
sorry, IRFH5302 on my board
sr. member
Activity: 378
Merit: 250
has already someone found the "vMod 1" aka bridge-two-jumpers?

I checked on the schematics of the pod, so, basically, you are bridging R333, and then you enable voltage=1 all the time by bridging R337.
They are connected to pin 13 and 12 of the up1509, so quite easy to find.
 I'll have a look after breakfast.

I'll check on the PCB, but not sure I'll mod this one. I managed to get 2 hw errors on 8 hours @ 7.2MH/s with my custom cooling.
I'll buy a second one to try.

[2014-05-04 08:14:07] Runtime: 8 hrs : 48 mins : 59 secs
[2014-05-04 08:14:07] Average hashrate: 7.2 Megahash/s
[2014-05-04 08:14:07] Solved blocks: 0
[2014-05-04 08:14:07] Best share difficulty: 1.5M
[2014-05-04 08:14:07] Share submissions: 2352
[2014-05-04 08:14:07] Accepted shares: 2337
[2014-05-04 08:14:07] Rejected shares: 15
[2014-05-04 08:14:07] Accepted difficulty shares: 3346304
[2014-05-04 08:14:07] Rejected difficulty shares: 20864
[2014-05-04 08:14:07] Reject ratio: 0.6%
[2014-05-04 08:14:07] Hardware errors: 2
[2014-05-04 08:14:07] Utility (accepted shares / min): 4.42/min

Hey J4, can you post some pics of your modded cards with heat sinks etc?
Sounds like you're getting close to the final design stage.
Good work!
I just hope there's not too much to mod in order to achieve stable overclocks.
Wolfey2014
sr. member
Activity: 412
Merit: 250
5002? on the Pic from Cryptomining-Blog its 5301
yes for this one I found datasheet as I se this one controlls 2x IRF5300
http://www.irf.com/product-info/datasheets/data/irfh5301pbf.pdf
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