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How to Vmod a 660 ti?

post #1 of 41
Thread Starter 
I'm guessing I hit a barrier with my 660ti. I'm stuck with 1212mV Vcore, but can get the card to run stable over 1300MHz, although I'm not even hitting 40°C.

Is there any way to Vmod the card? At least the Vcore?


Here are some detailed PCB images I found of the card in question (Gigabyte GV-N660TOC-2GD):

post #2 of 41
Please post the numbers/letters written on the chips boxed in yellow.




Also, do you have a multimeter, soldering iron, and soldering skills? As those will be required to do a mod.
    
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post #3 of 41
Thread Starter 
This is on the front PCB:



It was hard to read, but I figured this out:
uP6210AG
ACK06S


The rear one is:






And yes I have a Multimeter (measures 200mV-250V DC, 200Ω-2MΩ), all needed soldering appliances plus a few hours of soldering in my book wink.gif
post #4 of 41
http://ceemic.pri.ee/hardware/datasheets/uP6210.pdf
http://www.onsemi.com/pub_link/Collateral/NCP5392P-D.PDF

You're looking at pins FB on the 1st one, and VFB on the 2nd. If I'm not mistaking, those are the mod points. Measure the resistance between FB and GND then multiply that by 20 and you get the appropriate value of a variable resistor you can use.
You can also try to pencil, I think tongue.gif
post #5 of 41
Thread Starter 
Thanks, ill check it out as soon as I'm home.
Could you tell me what's behind the multiplier of 20? Is this a general value used for any card?
post #6 of 41
Madness is correct on the mod points. Pin 6 on the uP chip, and pin 17 on the ON chip are the pins to mod.




Because there is very little surface area on those pins, I'd suggest finding a connection point to that pin from one of the other components on the board near that pin. I marked possible points in yellow. Basically, you are just looking from something that is connected directly to the pin on the chip. Then you can easily probe that point in the future, and also use it as a place to solder your VR to. If none of those points work, just expand your search outward. There should be a point around the chip that is connected to the pin on the chip.

This guy is working on the same NCP5392 controller. Looks like his pin17 resistance was ~14k.

The 20x larger VR is done so that when you put the VR in the circuit, you don't drastically change the voltage. The resistance you measure to ground from the pin on the chip is in parallel with the VR you add. Parallel resistance is calculated as the product divided by the sum of the original circuit resistance and the VR: Rnew = (R*Rvr) / (R+Rvr). So if you chose some random values like, 1000 (resistance of the circuit) and 20000 (vr resistance) then the new resistance is 952, which is very close to the original of 1000. Then instead try 10000. The new value is 909, which can be significant.

Basically you are trying to not mess up the circuit until you turn it on and start turning the VR yourself, while looking at the measured voltage thumb.gif
    
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post #7 of 41
^you need a medal sir. That was so well explained!
What about pencil dude. He can pencil one of those resistors/caps to get higher volts right? But with pencil he has to be careful not to over do it!
post #8 of 41
Thread Starter 
Thanks for the help guys, I really appreciate it thumb.gif

I'll only do the GPU voltage, as the memory has enough headroom and isn't cooled, so doing any hardmod on it seems senseless to me.




I measured directly at the pin and followed the purple line to the marked point: 12,45K. Meaning I would need a 250K VR?


I found this "Uncorking Kepler" thread over on the Kingpin board, and TiN uses a DIP switch with 4.7K resistors to regulate the voltage. Is this actually needed, or only for manual regulation?

Quote:
Originally Posted by madness777 View Post

^you need a medal sir. That was so well explained!
What about pencil dude. He can pencil one of those resistors/caps to get higher volts right? But with pencil he has to be careful not to over do it!
I'll try that out! I have to wait for the VR shipment anyway (we don't have any shop closeby that sells them rolleyes.gif)
Edited by Rayce185 - 12/7/12 at 11:46am
post #9 of 41
Quote:
Originally Posted by Rayce185 View Post

I measured directly at the pin and followed the purple line to the marked point: 12,45K. Meaning I would need a 250K VR?
That sounds good thumb.gif

Quote:
I found this "Uncorking Kepler" thread over on the Kingpin board, and TiN uses a DIP switch with 4.7K resistors to regulate the voltage. Is this actually needed, or only for manual regulation?
From my understanding, he is actually reprogramming the chip. In the datasheet, it shows pins 2-9 as VID pins. These pins are pulled high (5v or so) or low (gnd) to represent binary 1's and 0's. On pages 14-17 show VID tables that tell you what controller will set the voltage to based on how the pins are set. TiN is making it so he can manually change VID pins.

He did this because the controller has a draw back.
Quote:
It have one drawback tho,
OVP is not adjustable and fixed internally to offset from VID setting, so to prevent triggering protection during heavy loading/overvolting good way is to use VID mod.
Also, he is using a different controller chip, so it doesn't necessarily apply wink.gif
Quote:
Originally Posted by madness777 View Post

^you need a medal sir. That was so well explained!
What about pencil dude. He can pencil one of those resistors/caps to get higher volts right? But with pencil he has to be careful not to over do it!
I doubt a pencil mod is possible. We are trying to change the resistance to ground at the VFB pin so that the error amplifier thinks the output is too low, and thus increases it to compensate. Based on the application circuit, there is no external resistor to ground, so it probably uses an internal resistor. Thus there might not be a resistor that can be changed.

The VR still works since you don't need to know where that resistance is, since we are putting it in parallel.
Edited by just_nuke_em - 12/7/12 at 12:29pm
    
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post #10 of 41
Thread Starter 
Quote:
Originally Posted by just_nuke_em View Post

That sounds good thumb.gif
From my understanding, he is actually reprogramming the chip. In the datasheet, it shows pins 2-9 as VID pins. These pins are pulled high (5v or so) or low (gnd) to represent binary 1's and 0's. On pages 14-17 show VID tables that tell you what controller will set the voltage to based on how the pins are set. TiN is making it so he can manually change VID pins.
He did this because the controller has a draw back.
Also, he is using a different controller chip, so it doesn't necessarily apply wink.gif
I doubt a pencil mod is possible. We are trying to change the resistance to ground at the VFB pin so that the error amplifier thinks the output is too low, and thus increases it to compensate. Based on the application circuit, there is no external resistor to ground, so it probably uses an internal resistor. Thus there might not be a resister that can be changed.
The VR still works since you don't need to know where that resistance is, since we are putting it in parallel.

I thought so on the "manual override". Problem is that via software the voltage is limited to 1212mV, and I've maxed that out already. So how could I increase this? Is that where the VR comes into play?


I did a quick pencil mod to see what happens. From the original 12,45K it went down to 12,15K. Threw the card into the rig... and no difference. Is the 0,3K decrease too small?
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