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7900GT/GS at 1.7V GPU mod

post #1 of 15
Thread Starter 
Ok guys,

I've been doing a lot of reading about this, I finally got my Video card at 1.55v... but I'm starting to look into the 1.7v mod since I have room for higher temps. My MAX temp at the moment is 62.. but is usualy at 55c when gaming.

Here is the link I found with the procedure well explained, seems simple enough.

http://forumz.tomshardware.com/hardw...ict180344.html

The only problem is that they suggest doing permanent modifications to the resistors on the Video card and this could prevent me from sending my card for RMA in case something goes wrong or if the card decides to crap out on me.

Here's is a quick resume of the 1.7V modification: Completely remove 2 of the over current protection resistors and then replace the GPU voltage regulation resistor with a smaller resistor in order to increase voltage from 1.2v to 1.5v. Then use conductive ink to relay the 1v or 2v points to the ground point (this conductive ink part is the same as the 1.3/1.4/1.5 or 1.55v mod)

I'm thinking of attempting this 1.7V mod in a similar fashion as the memory volt mod (with a carbon pencil and conductive ink)....

let me explain.

Instead of removing the 2 over current resistors I could apply a bit of conductive ink right on top of the 2 resistors... then measure for resistance with a Multimetre... it should then read 0. If I'm not mistaken this would be the equivalent of removing the resistors themselves since the current will take the passage with less resistance (my conductive ink). As far as the GPU voltage resistor, instead of replacing it... why not apply carbon pencil on the resistor in order to increase the voltage.... same as the memory volt mod.

So? what do you guys think?
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post #2 of 15
Sounds like a bad idea... What kind of overclocks are you getting on your 1.55v? Temps aren't the only way to see if your voltage is safe. The extra volts can still fry your card even if you are getting 40c load.

But if you're really a risktaker, then try it out.
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post #3 of 15
Thread Starter 
From what I've read you only truly start to get electron migration at 1.9v

There is only 1 part I'm not certain of and its my idea with the conductive ink and the resistors. The instructions state to remove these two resistors in order to disable the over current protection, but the problem is that they don't really say if you need to re-solder the missing gap or just leave it empty.

If the case is that you need to leave the space empty, then my idea will definitely fry the GPU... if your supposed to re-solder, then I'm 99% it would work.
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post #4 of 15
Thread Starter 
I've read the instructions again, it says to remove the 2 over current protection resistors. So I guess I can't use my bright idea of covering the resistors with conductive ink

What is the safest and easiest way of removing resistors?.... a flat heat screw driver?
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post #5 of 15
Here are the problems with this idea (after a bit of reading, this link is very good, but you must register to see the pictures):

1. The resistor that must be replaced with a 50k resistor is actually 5k originally. This means that you would need to increase the resistance, which cannot be done by penciling, or even by soldering one in parallel. You can't get around replacing it with a 50k resistor.

2. The good news is that the alledged "overcurrent protection" resistor are not actually that. So you should not remove them.

3. There is also another resistor that can potentially help stability if you pencil mod it (stability with respect to GPU). I am not sure if it can help increase your max stable overclock, but I might try it.

So definitely read the above guide and re-think your plan. Also, if you try penciling "resistor B" to 45k and it helps your core overclock, definitely let me know.

I hope this helps you keep from screwing up your card.
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post #6 of 15
Thread Starter 
Quote:
Originally Posted by Artmasterx View Post
Here are the problems with this idea (after a bit of reading, this link is very good, but you must register to see the pictures):

1. The resistor that must be replaced with a 50k resistor is actually 5k originally. This means that you would need to increase the resistance, which cannot be done by penciling, or even by soldering one in parallel. You can't get around replacing it with a 50k resistor.

2. The good news is that the alledged "overcurrent protection" resistor are not actually that. So you should not remove them.

3. There is also another resistor that can potentially help stability if you pencil mod it (stability with respect to GPU). I am not sure if it can help increase your max stable overclock, but I might try it.

So definitely read the above guide and re-think your plan. Also, if you try penciling "resistor B" to 45k and it helps your core overclock, definitely let me know.

I hope this helps you keep from screwing up your card.
It definitaly helps, so to increase behond 1.55v I absolutely need to change that resistor
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post #7 of 15
Thread Starter 
Thanks for finding that thread for me, its very well explained.

I'm a bit disappointed about needing to change the 5K ohm resistor to a 50K ohm resistor in order to increase the base voltage to 1.5v. I don't have the tools to do that and don't plan on spending the money.

I'll probably try to lower the K chip at 45k ohm with some graphite and see if it helps.
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post #8 of 15
Yeah, let me know how that goes. I may give it a try Wed. or Thurs. night since it seems like it would be pretty easy... I don't have the motivation to do it tonight and it's getting "late" here on the east coast.

I also think I need to get a heatsink of the chips near the RAM volt mod. I wouldn't want to melt any of them. Who knows, it may allow you push the RAM a bit higher as well.
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post #9 of 15
Thread Starter 
Quote:
Originally Posted by Artmasterx View Post
Yeah, let me know how that goes. I may give it a try Wed. or Thurs. night since it seems like it would be pretty easy... I don't have the motivation to do it tonight and it's getting "late" here on the east coast.

I also think I need to get a heatsink of the chips near the RAM volt mod. I wouldn't want to melt any of them. Who knows, it may allow you push the RAM a bit higher as well.
Yeah, I saw that suggestion about installing a heat sink on the chip near the Ram volt mod; it’s the first time I see that. Its suggested to get one as soon as you volt mod and OC your ram.

I'll probably try adding a bit of pencil graphite on the regulator chip, sometimes this week or this weekend.
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post #10 of 15
Thread Starter 
I'm at home sick today... so what the heck! I measured the stock resistance on the chip and it was around 86 or 89KOhm, can't remember exactly. I brought it down to 45Kohm with pencil graphite.

It didn't help... same GPU OC as before. I guess this modification is only needed when going over 1.55v. I'm still going to run a bench mark to see if it helped.

I touched the small chips that supposedly get really warm when volt moding the ram.. OMG!! I almost burned my finger.

I think I'll steal one of my Motherboard ram heat sinks and install it on the video card pronto!
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