GRIDSEED G-BLADE Overclocking 7Mh/s, improvements and repair

[J4bberwock]

here is the bridge voltmod for the blade. still untested, I'll have to physically check on the board for voltage =1 to be sure

[greatway]

is it better to buy gridseed or buy btc?

[darkfriend77]

is it better to buy gridseed or buy btc?

probably it's better to read up some days about cryptocurreny & mining for you.

[GridseedForever]

I just bought a blade and found some dodgy chinese software that can get an extra 100k/s out of a normal gridseed but it works, not sure about the blades though. I would like to try it one one just worried about breaking ir. Looks like the software "undervolts" the gridseed in someway (thats what the terminal says anyway) and then bam I got 100kh/s extra. You have to do some hardware messing around with also though,

I dont think Im allowed to post public links on this forum so pm me if you want the link.

[nemercry]

here is the bridge voltmod for the blade. still untested, I'll have to physically check on the board for voltage =1 to be sure

Which resistor value will then be enabled ?
36k resistor ? Also, where is it located ?

Regards

[Xer0]

here is the bridge voltmod for the blade. still untested, I'll have to physically check on the board for voltage =1 to be sure

thanks! great work

[Blisk]

So this one is withouth changing resistor.
I am more interested to adding mosfets to Q6 to Q8
what is exact mark of Q6 to Q8, here on pic is unreadable?

[J4bberwock]

Which resistor value will then be enabled ?
36k resistor ? Also, where is it located ?

Regards

resistors are as follow from left to right on my picture
33k (the one I replaced for the first mod)
27k
33k
36k <- should use this one when bridging

So this one is withouth changing resistor.
I am more interested to adding mosfets to Q6 to Q8
what is exact mark of Q6 to Q8, here on pic is unreadable?

it's been discussed on this thread.
they are 2x IRF5300 and one IRFH5302

I ordered IRFH7004 to try as a direct replacement and IRFB7437PBF for an homemade powerboard

[Blisk]

I see that replacament should work 7004 have much more ampers.
But didn't find 5002

[Xer0]

5002? on the Pic from Cryptomining-Blog its 5301

[Blisk]

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

[wolfey2014]

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

[J4bberwock]

I see that replacament should work 7004 have much more ampers.
But didn't find 5002

sorry, IRFH5302 on my board

[Blisk]

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

[xcooling]

looking for good replacements of FB29 and FB30 , any suggestions ?

[Blisk]

looking for good replacements of FB29 and FB30 , any suggestions ?

use regular one

[J4bberwock]

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.

[Blisk]

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?

[J4bberwock]

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

[Blisk]

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