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Help me Vmod a GTX 650ti!

post #1 of 64
Thread Starter 
So it looks like Bios modding isn't going to work on this card so it is time to try a Vmod! Let me know what you guys think and if you need higher resolution pictures or ones without the stickers. thumb.gif
I know, I know 2 phase VRMs.... frown.gif but I'm only planning on bumping the voltage a little and I will watch the voltage and temps like a hawk.

http://www.hardwareluxx.de/media/jphoto/artikel-galerien/test-nvidia-geforce-gtx-650-ti-/nvidia-geforce-gtx650ti-33-950x604.jpg

http://www.hardwareluxx.de/media/jphoto/artikel-galerien/test-nvidia-geforce-gtx-650-ti-/nvidia-geforce-gtx650ti-28-950x603.jpg

Edit: LMK what types of components I am looking for on the board or at least the general area and I will get some HI-Res pictures. Also the item under the warranty sticker feels like a long chip of some sort.
Edited by FXVIZI - 1/19/13 at 12:22am
    
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post #2 of 64
Looks like the controller chips will be on the back. Read off the numbers on the two chips marked in yellow. Also, lift up the big sticker and see if there are any chips under there.

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post #3 of 64
Thread Starter 
https://docs.google.com/folder/d/0B25t5cshX9MxMloxem4tTEJ4Vzg/edit

Red dotted one:
G 25020T
E4E784
AE1217

Regular one:
EM
5303A
BEG1509

No chips under sticker.
Sorry for the crappy cell phone pictures. I didn't realize there was a smudge on the lens and my cousin took her good camera with her.
Thanks for the help!
Edited by FXVIZI - 1/20/13 at 1:56am
    
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AMD FX-8320 GA-990fxa-UD3 EVGA Geforce GTX 650TI G.SKILL Ripjaws X Series 16GB (4 x 4GB) 
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Seagate Barracuda ST1000DM003 1TB 7200 RPM 64MB... LG CD/DVD Burner Antec 620 on GPU Windows 7 ultimate 
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Seagate Barracuda ST1000DM003 1TB 7200 RPM 64MB... LG CD/DVD Burner Antec 620 on GPU Windows 7 ultimate 
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post #4 of 64
Thread Starter 
I don't know about you, but I can't find any datasheets for this chips. Although I think 25020T is the EEPROM?

I did find the MOSFET datasheet though! Looks like I am pushing limits...
http://www.onsemi.com/pub_link/Collateral/NTMFS4985NF-D.PDF
Edited by FXVIZI - 1/20/13 at 5:19pm
    
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Seagate Barracuda ST1000DM003 1TB 7200 RPM 64MB... LG CD/DVD Burner Antec 620 on GPU Windows 7 ultimate 
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post #5 of 64
Neither of those chips are controller chips. Check under all the stickers, there has to be something else. see below redface.gif
Quote:
Originally Posted by FXVIZI View Post

I did find the MOSFET datasheet though! Looks like I am pushing limits...
http://www.onsemi.com/pub_link/Collateral/NTMFS4985NF-D.PDF
You will almost always be pushing limits when overclocking, since overclocking really is pushing the components beyond the manufacture's recommended spec.
Edited by just_nuke_em - 1/20/13 at 10:45pm
    
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post #6 of 64
Thread Starter 
The rest of the stickers are completely smooth and on bare PCB.
the only other microchip is the:
08 EH VOK
Located by the VRM caps
    
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32" Vizio HDTV Logitech K400r CORSAIR Builder Series CX600 600W ATX12V v2.3 8... Rosewill CHALLENGER Black Gaming ATX Mid Tower  
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CPUMotherboardGraphicsRAM
AMD FX-8320 GA-990fxa-UD3 EVGA Geforce GTX 650TI G.SKILL Ripjaws X Series 16GB (4 x 4GB) 
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Seagate Barracuda ST1000DM003 1TB 7200 RPM 64MB... LG CD/DVD Burner Antec 620 on GPU Windows 7 ultimate 
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32" Vizio HDTV Logitech K400r CORSAIR Builder Series CX600 600W ATX12V v2.3 8... Rosewill CHALLENGER Black Gaming ATX Mid Tower  
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post #7 of 64
double post
Edited by just_nuke_em - 1/20/13 at 10:32pm
    
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CPUMotherboardGraphicsRAM
FX-8120, and a bunch more AM3/AM2+ Crosshair V, Crosshair IV Lots of green Dominator GT 
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post #8 of 64
Here is the core controller.




The numbers don't tell us anything about what controller it is, so we shall have to find out how it is configured ourselves. I assume you have a digital multimeter (if not then the mod will be impossible to do). Please measure resistance to ground on each pin of that chip. Use the pcie bracket as the ground point.


Mem controller: http://www.excelliancemos.com/attachments/File/undefined/EM5303&A.pdf



Measure resistance to ground from pin 7.
Edited by just_nuke_em - 1/20/13 at 10:43pm
    
CPUMotherboardGraphicsRAM
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Dimastech Hard 
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CPUMotherboardGraphicsRAM
FX-8120, and a bunch more AM3/AM2+ Crosshair V, Crosshair IV Lots of green Dominator GT 
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Dominator GT Perfect Storm M4 64Gb Dihydrogen monoxide, Carbon dioxide, Liquid Nit... 
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post #9 of 64
Thread Starter 
Turns out it was the sticker playing a trick on us. That was a cluster of 3 smallish transistors, I just tagged them in one of the pictures.
As far as I can tell the boards are identical. Although, my board is revision 1.0 and theirs is 0.0 so there could be a very slight difference. What about the little guy in the lower right on the front side? (U7 board title)

Yeah I can take it out and take better pictures. I just didn't want to mess with the hassle of remounting the block just yet, but if I have to I will.
Better yet you want to see it for your own eyes? I'm up in Marysville


edit: Oh excellent! I'll be sure to do that in a couple days. Probably after the foldathon. Of course I have a multi-meter and soldering iron, should probably get a smaller one though.
Edited by FXVIZI - 1/20/13 at 11:06pm
    
CPUMotherboardGraphicsRAM
AMD FX-8320 GA-990fxa-UD3 EVGA Geforce GTX 650TI G.SKILL Ripjaws X Series 16GB (4 x 4GB) 
Hard DriveOptical DriveCoolingOS
Seagate Barracuda ST1000DM003 1TB 7200 RPM 64MB... LG CD/DVD Burner Antec 620 on GPU Windows 7 ultimate 
MonitorKeyboardPowerCase
32" Vizio HDTV Logitech K400r CORSAIR Builder Series CX600 600W ATX12V v2.3 8... Rosewill CHALLENGER Black Gaming ATX Mid Tower  
AudioOther
4.3 surround sound powered by nVidia HD audio Intel Centrino Advanced-N 6205 
  hide details  
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CPUMotherboardGraphicsRAM
AMD FX-8320 GA-990fxa-UD3 EVGA Geforce GTX 650TI G.SKILL Ripjaws X Series 16GB (4 x 4GB) 
Hard DriveOptical DriveCoolingOS
Seagate Barracuda ST1000DM003 1TB 7200 RPM 64MB... LG CD/DVD Burner Antec 620 on GPU Windows 7 ultimate 
MonitorKeyboardPowerCase
32" Vizio HDTV Logitech K400r CORSAIR Builder Series CX600 600W ATX12V v2.3 8... Rosewill CHALLENGER Black Gaming ATX Mid Tower  
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post #10 of 64
Thread Starter 
Quote:
Originally Posted by just_nuke_em View Post

Neither of those chips are controller chips. Check under all the stickers, there has to be something else. see below redface.gif
You will almost always be pushing limits when overclocking, since overclocking really is pushing the components beyond the manufacture's recommended spec.

Never said I didn't like pushing the limits smile.gif Why would I looking to Vmod if I didn't haha
I more meant I am already getting close to the VRMs limit even without the Vmod.
Edited by FXVIZI - 1/20/13 at 11:15pm
    
CPUMotherboardGraphicsRAM
AMD FX-8320 GA-990fxa-UD3 EVGA Geforce GTX 650TI G.SKILL Ripjaws X Series 16GB (4 x 4GB) 
Hard DriveOptical DriveCoolingOS
Seagate Barracuda ST1000DM003 1TB 7200 RPM 64MB... LG CD/DVD Burner Antec 620 on GPU Windows 7 ultimate 
MonitorKeyboardPowerCase
32" Vizio HDTV Logitech K400r CORSAIR Builder Series CX600 600W ATX12V v2.3 8... Rosewill CHALLENGER Black Gaming ATX Mid Tower  
AudioOther
4.3 surround sound powered by nVidia HD audio Intel Centrino Advanced-N 6205 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
AMD FX-8320 GA-990fxa-UD3 EVGA Geforce GTX 650TI G.SKILL Ripjaws X Series 16GB (4 x 4GB) 
Hard DriveOptical DriveCoolingOS
Seagate Barracuda ST1000DM003 1TB 7200 RPM 64MB... LG CD/DVD Burner Antec 620 on GPU Windows 7 ultimate 
MonitorKeyboardPowerCase
32" Vizio HDTV Logitech K400r CORSAIR Builder Series CX600 600W ATX12V v2.3 8... Rosewill CHALLENGER Black Gaming ATX Mid Tower  
AudioOther
4.3 surround sound powered by nVidia HD audio Intel Centrino Advanced-N 6205 
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