9800gtx volt mod... Again.

[ChanceCoats123]

Yes, I am well aware there are already volt mods out there, but none of them are even close to my card... I was looking at the xs mod and one on ocer's and their cards were totally opposite of mine. I was kind of looking for pretty much a walk through here. I know how to do the soldering and that, but I don't know what gauge wire I need, what kind of ohm resistor I need. I don't even know what that is and I probably don't need whatever that is... But here are the pics so you have an idea...

http://i302.photobucket.com/albums/nn119/ChanceCoats123/DSCN0891.jpg

http://i302.photobucket.com/albums/nn119/ChanceCoats123/DSCN0885.jpg

http://i302.photobucket.com/albums/nn119/ChanceCoats123/DSCN0886.jpg

http://i302.photobucket.com/albums/nn119/ChanceCoats123/DSCN0887.jpg

http://i302.photobucket.com/albums/nn119/ChanceCoats123/DSCN0889.jpg

http://i302.photobucket.com/albums/nn119/ChanceCoats123/DSCN0890.jpg

[ChanceCoats123]

Bump?

[||Console||]

http://www.xtremesystems.org/forums/showthread.php?t=182767

[||Console||]

It looks the same as all the other G92's
Make sure you have good cooling on your vregs or you could have this happen

[ChanceCoats123]

well, from what I have seen you solder from one of the pins near the primarion controller, but my card doesn't have a primarion controller... I also mentioned I have no idea what parts are needed or what the parts even are... But I do know that is the omega symbol! haha, what is that by the way so I can look into buying one?

[||Console||]

What does that chip say ?
http://i154.photobucket.com/albums/s257/consoleupload/DSCN0887.jpg

[xtkxhom3r]

mmm voltage mods... good luck man and you should consider watercooling it before you start modding... just a thought

[ChanceCoats123]

mmm voltage mods... good luck man and you should consider watercooling it before you start modding... just a thought

Yeah, I'll get there eventually... It's not in it for the wallet at the moment though... :bang head:

What does that chip say ?
http://i154.photobucket.com/albums/s257/consoleupload/DSCN0887.jpg

It doesn't. It's like the words are scratched off. But, I was looking at this picture (http://spacemaster.sx-team.com/Sesije/9800GTX/Velike/DSCF0292.jpg) and I found so similarities between my card and his, but my card seems to have a lot of key points misplaced....

Edit: I dug a little deeper for you console and although the letters were very small, I got a general idea of what it says. Firstly, I am to believe the chip is "on" brand, because it has the word on with a circle around it in the middle. Then below, here is my interpretation: first line: NCP5386 and second line: 65ACD7446.

[||Console||]

Can you take a high res macro shot of that area ?

[ChanceCoats123]

I'll see what I can do, the nikkor lens likes to act up from time to time...

Edit: I took a couple and that worked out rather well! I picked the best and here it is:
http://i302.photobucket.com/albums/nn119/ChanceCoats123/Macroofvoltmod.jpg

I also noticed I was pretty far off on the numbers! Haha.

[jason4207]

Omega is the symbol for Ohms...a measure of resistance.

I find 30AWG wire works best. In a pinch you can use some old cut-up 80-pin IDE cables.

Like most voltage mods you are looking for the v_sense pin. It's a voltage feedback loop. You measure the resistance of the v_sense circuit, and then add a variable resistor in parallel to adjust the overall resistance of the circuit. A relatively high resistance added in parallel to any circuit will have very little effect, so you always want to start w/ the variable resistor adjusted to max resistance, and then adjust in real-time while the card is running. A low resistance added in parallel to any circuit is a recipe for disaster. So, adding a variable resistor that is set to 0 Ohms will most likely kill your card instantly when you power it on. Pay attention to the variable resistor's legs. When one leg is maxed out, the other is at 0 Ohms. I always cut 1 leg off.

The rule of thumb is to select a variable resistor that is ~20x the value of the default v_sense circuit resistance. But, you also have to consider that the lower the value you select the greater the control you will have over the voltage. Higher values are safer for starting out, but lower values are more fine-tunable. It's a balancing act. I use 3-pin fan connectors on my volt-mods, so that I can easily swap out VR's if needed.

Always measure the resistance of the circuit before powering the card on. You will be able to tell if your vmod is even working this way, and you can also see that you are not changing the v_sense resistance too much w/ your mod before you put any power through it.

Vmods are not for the faint of heart, and you will be surprised how small the solder points are if you're not used to soldering things this small (I use wearable magnifying lenses). You not knowing some basic electronics knowledge kind of scares me. I highly recommend you practice a LOT on some older/broken piece of electronics that has similar sized solder points before taking a risk on your working gfx card.

[ChanceCoats123]

Omega is the symbol for Ohms...a measure of resistance.

I find 30AWG wire works best. In a pinch you can use some old cut-up 80-pin IDE cables.

Like most voltage mods you are looking for the v_sense pin. It's a voltage feedback loop. You measure the resistance of the v_sense circuit, and then add a variable resistor in parallel to adjust the overall resistance of the circuit. A relatively high resistance added in parallel to any circuit will have very little effect, so you always want to start w/ the variable resistor adjusted to max resistance, and then adjust in real-time while the card is running. A low resistance added in parallel to any circuit is a recipe for disaster. So, adding a variable resistor that is set to 0 Ohms will most likely kill your card instantly when you power it on. Pay attention to the variable resistor's legs. When one leg is maxed out, the other is at 0 Ohms. I always cut 1 leg off.

The rule of thumb is to select a variable resistor that is ~20x the value of the default v_sense circuit resistance. But, you also have to consider that the lower the value you select the greater the control you will have over the voltage. Higher values are safer for starting out, but lower values are more fine-tunable. It's a balancing act. I use 3-pin fan connectors on my volt-mods, so that I can easily swap out VR's if needed.

Always measure the resistance of the circuit before powering the card on. You will be able to tell if your vmod is even working this way, and you can also see that you are not changing the v_sense resistance too much w/ your mod before you put any power through it.

Vmods are not for the faint of heart, and you will be surprised how small the solder points are if you're not used to soldering things this small (I use wearable magnifying lenses). You not knowing some basic electronics knowledge kind of scares me. I highly recommend you practice a LOT on some older/broken piece of electronics that has similar sized solder points before taking a risk on your working gfx card.

Seriously, best advice the whole thread. I was kind of looking for someone to say that so I would have a reason not to... But either way, I ordered my new cpu today so I am going to wait working on the graphics anyway. And also, thanks for the in depth explanation.

[||Console||]

Even though the Ic has a differnt name on it all the other parts are int he same place .

[ChinStrap]

Even though the Ic has a differnt name on it all the other parts are int he same place .

not true

his...
http://i302.photobucket.com/albums/nn119/ChanceCoats123/Macroofvoltmod.jpg

g92 gts reference
http://img.photobucket.com/albums/v310/T_M/G92-8800GTS-vMods.jpg

g92 gtx(+) reference
http://i28.photobucket.com/albums/c235/Snatch362/9800GTX_vGPU_preli.jpg

[ChanceCoats123]

... I noticed that before and that is why I started this thread, but I was wondering why they didn't make the cards the same? Does it make a difference that my card only takes on 6-pin?

[jason4207]

I thought all G92's only took 1 6-pin.

Why did they change the chip design? Possibly to save money somehow.