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PNY 8500GT Volt mod. Completed & Verified.

post #1 of 62
2/14/10 at 11:29am
Thread Starter 
I was reading this thread:
http://www.overclock.net/graphics-ca...od-8500gt.html

But our card layouts are different. I took some pictures of my card. Any help is much appreciated.


The front of the card with a modified southbridge chipset cooler.




The overall look of the back of the card.



Some closer pictures.




top left of the card:


Closer view of the suspected area of the VGPU measure points, and the VGPU mod:



EDIT:

I will save you the extra clicking by updating this here

Here is the Vmod:


Here is the Vmod coated with hot glue, but one of the GPU test points is the yellow wire:


And here it is all together. (the black wire is ground)

Edited by nateman_doo - 2/22/10 at 2:57pm
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post #2 of 62
2/14/10 at 12:08pm
that cards gonna need some extra caps to go far... has very weak power regulation ...have you found the data-sheets for the IC's yet?
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post #3 of 62
2/14/10 at 12:15pm
Thread Starter 
where would I find that? and for which IC?

I got plenty of caps from my 780i board. which ones are needed & where?
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post #4 of 62
2/14/10 at 12:20pm


well thats GPU controller..if you dont already know the mod for it, you can google the #'s on the top of it to find the data-sheet...same with mem mod ..




as for caps...looks like the 2x electrolytic caps near the GPUv inductor coil are already swollen and leaking...I would replace them altogether..and piggy-back additonal caps onto all the others..

2.4-6.3v for ouput caps and 16v for input caps.
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post #5 of 62
2/14/10 at 12:37pm
Thread Starter 
This IC?
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post #6 of 62
2/14/10 at 12:47pm
Thread Starter 
Here is the data sheet. I appreciate you walking me through the process.

QSOP-16
LL
Edited by nateman_doo - 2/14/10 at 12:50pm
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post #7 of 62
2/14/10 at 1:51pm
Start by measuring the resistance between these two pins:
LL
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(13 items)
  		  
CPUMotherboardGraphicsRAM
|i5 750-voltage may vary| |Foxconn Katana[Non GTI]| 380 4Gb |4Gb/Tridents@Clocked| 
Hard DriveOSMonitorPower
|[V3/60Gb][500Gb]| |Windows 7 64 bit| |LG-EW224| |Antec HCG750| 
Case
|Tech Station| 
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EVOLVE
(13 items)
  		  
CPUMotherboardGraphicsRAM
|i5 750-voltage may vary| |Foxconn Katana[Non GTI]| 380 4Gb |4Gb/Tridents@Clocked| 
Hard DriveOSMonitorPower
|[V3/60Gb][500Gb]| |Windows 7 64 bit| |LG-EW224| |Antec HCG750| 
Case
|Tech Station| 
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  hide details  
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post #8 of 62
2/14/10 at 3:06pm
Thread Starter 
Something seems weird though, the MJ3CU labeled on the chip means it is a QSOP-16. But it looks like the SOP-14? both pins you labeled me to check do the same thing, but did they mis-label the chip?

1.034KΩ is the resistance between those 2 points.
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post #9 of 62
2/14/10 at 3:52pm
Quote:
Originally Posted by nateman_doo View Post
Something seems weird though, the MJ3CU labeled on the chip means it is a QSOP-16. But it looks like the SOP-14? both pins you labeled me to check do the same thing, but did they mis-label the chip?

1.034KΩ is the resistance between those 2 points.
Its definitely a 14 pin. Multiply the resistance of 1.034 by 20 and you get 20.68k, so use a 20k VR. That should put you at 984.76 ohms or .984k. You should have a little higher than stock voltage with that VR from the jump.

EDIT: or you could use a 50k and be at 1013.05k, just more turns of the VR to increase voltage but closer to stock.
EVOLVE
(13 items)
  		  
CPUMotherboardGraphicsRAM
|i5 750-voltage may vary| |Foxconn Katana[Non GTI]| 380 4Gb |4Gb/Tridents@Clocked| 
Hard DriveOSMonitorPower
|[V3/60Gb][500Gb]| |Windows 7 64 bit| |LG-EW224| |Antec HCG750| 
Case
|Tech Station| 
View all
  hide details  
Reply
EVOLVE
(13 items)
  		  
CPUMotherboardGraphicsRAM
|i5 750-voltage may vary| |Foxconn Katana[Non GTI]| 380 4Gb |4Gb/Tridents@Clocked| 
Hard DriveOSMonitorPower
|[V3/60Gb][500Gb]| |Windows 7 64 bit| |LG-EW224| |Antec HCG750| 
Case
|Tech Station| 
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  hide details  
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post #10 of 62
2/14/10 at 4:27pm
Thread Starter 
how do u guys know thats the pin to go to?

I can understand how you would get values for resistance, but what exactly does the pin FB do? I see its the negative input to the 2 amps in the IC, but its slightly over my head.

I guess I am just trying to see how you guys figure this stuff out. its incredible, but looks so easy once you get the hang of it.

Attachment 141711
LL
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