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

[Blisk]

1100 MHz, 3.74Mh/s for the first board. I'll try higher resistor and try the second board one once I add the side fan to cool the VRM
1063MHz gives 3.62Mh/s

did you changed VRM already?
so you did replace 2x IRF5300 and 1x IRFH5301 with 2x CSD17556 and 1x CSD16321?

And they match, pin to pin, just get old one off and put new one on board?

Did anybody find some great prices for CSD17556 and 1x CSD16321?

[J4bberwock]

1100 MHz, 3.74Mh/s for the first board. I'll try higher resistor and try the second board one once I add the side fan to cool the VRM
1063MHz gives 3.62Mh/s

did you changed VRM already?
so you did replace 2x IRF5300 and 1x IRFH5301 with 2x CSD17556 and 1x CSD16321?

And they match, pin to pin, just get old one off and put new one on board?

Did anybody find some great prices for CSD17556 and 1x CSD16321?

Hi, I haven't changed IRF5300 and IRF5302 on my blade.
2x CSD17556 and 1x CSD16321 were on a new blade I just received and I'm voltmodding too.
They are pin to pin compatible.

I ordered IRF7004 (expensive) that I received today to replace the 5300-5302 ones on the "old" blade.

[Blisk]

1100 MHz, 3.74Mh/s for the first board. I'll try higher resistor and try the second board one once I add the side fan to cool the VRM
1063MHz gives 3.62Mh/s

did you changed VRM already?
so you did replace 2x IRF5300 and 1x IRFH5301 with 2x CSD17556 and 1x CSD16321?

And they match, pin to pin, just get old one off and put new one on board?

Did anybody find some great prices for CSD17556 and 1x CSD16321?

Hi, I haven't changed IRF5300 and IRF5302 on my blade.
2x CSD17556 and 1x CSD16321 were on a new blade I just received and I'm voltmodding too.
They are pin to pin compatible.

I ordered IRF7004 (expensive) that I received today to replace the 5300-5302 ones on the "old" blade.

but they are more powerfull or not?
it is not worth to change it if not

[J4bberwock]

1100 MHz, 3.74Mh/s for the first board. I'll try higher resistor and try the second board one once I add the side fan to cool the VRM
1063MHz gives 3.62Mh/s

did you changed VRM already?
so you did replace 2x IRF5300 and 1x IRFH5301 with 2x CSD17556 and 1x CSD16321?

And they match, pin to pin, just get old one off and put new one on board?

Did anybody find some great prices for CSD17556 and 1x CSD16321?

Hi, I haven't changed IRF5300 and IRF5302 on my blade.
2x CSD17556 and 1x CSD16321 were on a new blade I just received and I'm voltmodding too.
They are pin to pin compatible.

I ordered IRF7004 (expensive) that I received today to replace the 5300-5302 ones on the "old" blade.

but they are more powerfull or not?
it is not worth to change it if not

Hi, I don't think it's woth the change. They still shut down when using 47K resistor.

I'll upgrade to IRF7004 when I'll get my new SMD no clean solder paste

[Blisk]

Ok I will wait, to see what happends when you change it.

[bamsterdam]

Having some trouble optimizing my blades.. First we used cg miner at 888mhz and it said it was hashing at 3.02mh/s each blade so 6.04 / g blade. But I started to doubt if this hashrate was true since on the pools I was getting a lot less hashrate. Wolfey said to my I have to use cpu miner 1.0b. and use 838mhz I'm going to try that tonight Any other tips that could maximize the hashrate without voltmodding? First I want to have it stable ate at least 3mh/s each blade before I want to try voltmodding.

I use a computer with windows 7 but I'm going to switch it to linux I think. Any other tips ?

[natbyte]

You will struggle to get past 850 Mhz without volt molding, out of 10 individual blades this was my safe limit, many were happier at 838 Mhz with much lower hardware errors than 850 Mhz, this seems to be the sweet spot if overclocking non volt modded blades.

[bamsterdam]

thanks for your reply. I dont understand why cg miner is saying 6mh/s for every g blade at 888mhz if its not true? ..

[natbyte]

How many hardware errors over a good run of say 6 hours? Post a screenshot of your cgminer screen, you may have got a miner that runs happily at 888 Mhz however remember each hardware error is lost income and wasted power.

[wolfey2014]

thanks for your reply. I dont understand why cg miner is saying 6mh/s for every g blade at 888mhz if its not true? ..

Just like I told you in response to your PM late this morning. 838 is being touted as the sweet spot for non-volt-modded Blades.

Perhaps your lower than expected hash rate is due to the pool's stratum connection and or the difficulty setting being used by the port your Blades are connected to. These two factors play a HUGE role in pool side results be they positive or negative.

Try a different pool, try resetting via re-powering everything before you go fishing um, I mean pool hashing again

Try 838MHz clock. It's your best bet right now, to wit, 'hasher toutingness' on here
Try the same pool again or try a different pool.
I'm getting really good results with wammamine.com as far as local/pool hash ratios go.

Hope this helps!
Woof

[wolfey2014]

Hello J4! What's the latest progress? News?
You haven't seen any magic black smoke of late, have you? 
Hope not!

Fill us in. You've been missing for a few days since you threatened to achieve 8MHs or magic black smoke   

FYI....
I've had my 26 overclocked pods hashing away at as high at 17980KHs pool side. Lots of time hovering at 12MHs to 14MHs with very little to no HW errors.

Hope all is well, mate!

Wolfey2014

[J4bberwock]

Hello J4! What's the latest progress? News?
You haven't seen any magic black smoke of late, have you?  
Hope not!

Fill us in. You've been missing for a few days since you threatened to achieve 8MHs or magic black smoke    

FYI....
I've had my 26 overclocked pods hashing away at as high at 17980KHs pool side. Lots of time hovering at 12MHs to 14MHs with very little to no HW errors.

Hope all is well, mate!

Wolfey2014

Hi Wolfey,

I'm still waiting for my no clean SMD flux paste to arrive.
I received some heatsinks for the back of the PCB, I should receive my spacers for wide body at the beginning of next week.

I do expect that we are reaching the limits on the 2x IRF5300 and 1x IRFH5301 or 2x CSD17556 and 1x CSD16321 because they can stand a much lower constant load while they are hot than when they are cold.
So overcurrent built in protection closes the gate.

IRF7004 is a little better, but not that much.
Best bet would be something like this one as direct replacement
http://www.st.com/web/en/resource/technical/document/datasheet/CD00291104.pdf
The worst case will be that the up1509 reaches its limits, but as it's far from hot, it should still be ok for some extra amps.

Anyway, piggyback powerboard could be done, I'm still working on something.

[Blisk]

STL160N3LLH6
so this can replace IRF5300?

[J4bberwock]

STL160N3LLH6
so this can replace IRF5300?

it is pin to pin compatible, higher amps, higher amps at high temperature, so we should get better overclocking with it.
But we'd better go for to-220 packages since we have much more room available on the blades.
I'm trying to revive CryptKeeper's pod with IRFB7437.
If it goes back to life, I'll try replacing all the mosfets with TO-220 on one PCB of my blades.

BTW, why did they decide to go for 2 different types?

IRF00/5301/5302 or CSD17556/16321 do have almost the same datacheets.
I'm not an expert, but they are all N-channel power mosfets with almost the same values.

[Blisk]

I thought the same other day, to use to-220 you can cool it better and still can be almost at the same spot so you don't have dissapation on wires there is high current here.

Why they chaneg chips which are almost the same, only the price can be factor. They get chips for much lower price.
Did you find replacement for IRFH5301 also, to-220 housing?

I think I will order chips tomorrow because it takes almost 3 weeks to get it.

CryptKeeper's pod with IRFB7437?
he also did some modifications?
where is his topic?

[J4bberwock]

I thought the same other day, to use to-220 you can cool it better and still can be almost at the same spot so you don't have dissapation on wires there is high current here.

Why they chaneg chips which are almost the same, only the price can be factor. They get chips for much lower price.
Did you find replacement for IRFH5301 also, to-220 housing?

I think I will order chips tomorrow because it takes almost 3 weeks to get it.

CryptKeeper's pod with IRFB7437?
he also did some modifications?
where is his topic?

He has blown ferrite beads, so he sent the pod to me to try to revive it.

one power mosfet was shorted, so I replaced it with IRFB7437.

You can see on the picture that when exploding, the ferrite beads have badly damaged the PCB near the solder points for the fan.

If you do TO-220 conversion, beware the Gate/Source/Drain could be misplaced.

So here comes Frankenpod







It works just fine, I disconnected it after a few seconds to avoid overheating the GC3355, but even the 7437 was hot. It will need active cooling with dissipator.

[Blisk]

I have in my old not working computer psu some ferrits like this I think I will use these which are more pwerfull just need to measure it.
they looks something like this
http://info.ee.surrey.ac.uk/Workshop/advice/coils/BHCkt/frte01pic.jpg

Also I see you have all figured out which mosfets are replacable can you write which to-220 will you use for those 3 - 2x IRF5300 and 1x IRFH5301?

I have also figure out how to do it with TO-220
I will glue a big heatsink on the other side of board where are no chips and at the edges I will mount on it all TO-220.
Of corse with an insulation between them.
So they will be mounted on large heatsink and fan which is already on blades will coll it too.
What do you think about this?

[J4bberwock]

I have in my old not working computer psu some ferrits like this I think I will use these which are more pwerfull just need to measure it.
they looks something like this
http://info.ee.surrey.ac.uk/Workshop/advice/coils/BHCkt/frte01pic.jpg

Also I see you have all figured out which mosfets are replacable can you write which to-220 will you use for those 3 - 2x IRF5300 and 1x IRFH5301?

I have also figure out how to do it with TO-220
I will glue a big heatsink on the other side of board where are no chips and at the edges I will mount on it all TO-220.
Of corse with an insulation between them.
So they will be mounted on large heatsink and fan which is already on blades will coll it too.
What do you think about this?

TO-220 replacement should be done safely with IRFB7437 in place of IRFH5300/5301/5302
I'll also try IRF1404 that I can get way cheaper and is easier to source.

If I understant you correctly, you will glue the heatsink on board "A" next to the USB chip, over the empty header holes, to screw on it the TO-220 connected to board "B"
Am I right?
It could work, but you will need precise work because the solder pad for the Gate of the TO-220 is small and the soldering can easily break if stressed.

[Blisk]

this  IRFB7437 can replace all 3 chips?  IRFH5300/5301/5302

Why than they use two  IRF5300
and one IRFH5301?

what is difference with IRF1404 and IRFB7437? less power?

I found IRFB7437 for 1,17€ pcs

here is pic what I think will do with to-220 mosfet
this is look from a side

[xcooling]

Could be onto something