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RTX A2000 shunt mod


bartx
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Hello,

I'm looking for some help figuring out the shunt mod for RTX A2000. This card has no external power connector and it's limited to 70W. Any ideas?

EDIT: One of them is my bet, how to check which one?

 

1.jpg

2.jpg

Edited by bartx
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3 hours ago, bartx said:

I done it already

DSC_8088.JPG

What A2000 model was it; 6GB or 12GB?

What is the part number of the resistor that you used? Did you solder a resistor to both sides of the GPU?

What were your MH/s results after the mod and temps, please share?

Thanks

Edited by vvtopbaby
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Posted (edited)

Here are the results:

1135 / 5600 in HiveOS @ 49.34MH/s

I used 5mohm (miliohm) resistor soldered in parallel. but value is probably too low (power limit is set on very high level), my bet is that 20-50mohm resistor will cause reasonable power limit. Card takes 6-7W more from the grid in comparison to 1035/4200 settings (maxed out on water before the shunt mod). Simply 10% power increase for 10% hash rate.

12GB pcb is the same as 6GB, I don't see a reason why it's not possible on 12GB.

Card is water cooled, running it on stock cooling is extremely risky in my opinion.

Screenshot_14.png

Edited by bartx
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3 hours ago, bartx said:

Awesome work bro! I saw a company that made some water cooling blocks called Mining waterblocks- found them in facebook. Is that who u are using?

 

Here are the results:

1135 / 5600 in HiveOS @ 49.34MH/s

I used 5mohm (miliohm) resistor soldered in parallel. but value is probably too low (power limit is set on very high level), my bet is that 20-50mohm resistor will cause reasonable power limit. Card takes 6-7W more from the grid in comparison to 1035/4200 settings (maxed out on water before the shunt mod). Simply 10% power increase for 10% hash rate.

12GB pcb is the same as 6GB, I don't see a reason why it's not possible on 12GB.

Card is water cooled, running it on stock cooling is extremely risky in my opinion.

Screenshot_14.png

 

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4 hours ago, bartx said:

Here are the results:

1135 / 5600 in HiveOS @ 49.34MH/s

I used 5mohm (miliohm) resistor soldered in parallel. but value is probably too low (power limit is set on very high level), my bet is that 20-50mohm resistor will cause reasonable power limit. Card takes 6-7W more from the grid in comparison to 1035/4200 settings (maxed out on water before the shunt mod). Simply 10% power increase for 10% hash rate.

12GB pcb is the same as 6GB, I don't see a reason why it's not possible on 12GB.

Card is water cooled, running it on stock cooling is extremely risky in my opinion.

Screenshot_14.png

Great work!!! ---Could you please upload a few photos of the finished job and explain how to solder in parallel. Would be good to see the cooling setup. Thanks!

Did you only solder a resistor to one side of the board as shown above, or did you use a second resistor on the other side?

Edited by vvtopbaby
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  • 3 weeks later...

BartX would you possibly do a test with a 40mΩ resistor?
My guess is that ~8 watts more might be enough to achieve the 50MH/s.

image.png.e1f35d583716eb3ecd326a15cc508e5e.png

70Watt with water cooling:

 GPU 27°C -> 45.8MH/s

image.png.dcfffcd9809e1b343dc5942102cdd1e8.png

My guess after calculating ~78Watt = 50MH/s !?
This also keeps us in a safe frame

Edited by Schestex
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Hey Guys,

 

Do you think this increase in hashrate is also possible on the RTX A5000?

 

It currently gets to 104.3MH/s (ETH) running into Power Limit (NVIDIA's Limit of 230W). So if this GPU is Shunt Modded, it should also get more MH, correct?

 

Thanks!

 

 

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Posted (edited)
On 4/26/2022 at 2:28 PM, Schestex said:

BartX would you possibly do a test with a 40mΩ resistor?
My guess is that ~8 watts more might be enough to achieve the 50MH/s.

image.png.e1f35d583716eb3ecd326a15cc508e5e.png

70Watt with water cooling:

 GPU 27°C -> 45.8MH/s

image.png.dcfffcd9809e1b343dc5942102cdd1e8.png

My guess after calculating ~78Watt = 50MH/s !?
This also keeps us in a safe frame

Together with a friend we figured out 4mohm as the best (safe value). Either replace the original resistor with 4mohm or add 20mohm in parallel.

7 hours ago, kwebbb said:

Hey Guys,

 

Do you think this increase in hashrate is also possible on the RTX A5000?

 

It currently gets to 104.3MH/s (ETH) running into Power Limit (NVIDIA's Limit of 230W). So if this GPU is Shunt Modded, it should also get more MH, correct?

 

Thanks!

 

 

Please send me a private message, I have too look at it. You can be limited by various things. If you already hit your memory clock limits or temp is too high, then increasing the power limit won't give you any gain.

Edited by bartx
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Posted (edited)

So i did some tests:

RTX A2000 cases:

1. Fanless - fan power over 3PIN conntector to Molex 100%

  • Temp: 40°C 45,924MH/s

2. Watercooled

  • Temp: 20°C 45,928MH/s

image.png.0d9670837599e3af6cf1370f82d86e6f.png

Both runs in the max gpu powerlimit of 688mV.
When i do now some calculations:

70W = 45,928MH/s -> ~1,524 multiplicator
50MH/s * 1,524 = 76,2W

When we take a 0,5W resistor, we need 77W!

To replace the 5mOhm with 4mOhm isn't a good idea 87,51W!

I prefer for exactly 77W a 50mOhm resistor with 0.5W.

image.png.691003f5178cc205aaffa13efed4b7ba.png
or 45mOhm to have a little bit more power.
image.png.4f8a006bf9c6ba4a7aabc26990932617.png

Slot power 50mOhm: 82,5W
Slot power 45mOhm: 83,3W

This is in my eyes safer as 20mOhm

New power limit: 87,51 and slot 93,8!

Is there other hardware around as the PMD from ElmorLabs?

Edited by Schestex
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