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How to Vmod a 660 ti? - Page 2

post #11 of 41
VR is a more precise way of doing it, but you're risking damaging your card. If pencil doesn't work, VR is the only way! So wait for them to arrive, then take a spoon of sugar to get your hand stable and solder it on! GL
post #12 of 41
Quote:
Originally Posted by Rayce185 View Post

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?
The software talks to the BIOS on the card, then BIOS sets the VID pins on the controller. The VID mod takes away the BIOS-controller interaction and lets you change it yourself. Nvidia has decided that you cannot use software to tell the BIOS to change the voltage, this is what that Greenlight thing was about.
Quote:
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?
Don't trust software to tell you the correct voltage. .3k is a pretty small decrease. To see if it actually changed, you need to probe the voltage on the card yourself.
    
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post #13 of 41
Thread Starter 
Quote:
Originally Posted by just_nuke_em View Post

The software talks to the BIOS on the card, then BIOS sets the VID pins on the controller. The VID mod takes away the BIOS-controller interaction and lets you change it yourself. Nvidia has decided that you cannot use software to tell the BIOS to change the voltage, this is what that Greenlight thing was about.
Don't trust software to tell you the correct voltage. .3k is a pretty small decrease. To see if it actually changed, you need to probe the voltage on the card yourself.
As far as CrazyNuts says (The guy who made the KGB BIOS unlocker) the BIOS is locked to 1,212V. According to the VID chart, the chip should be able to push to 1.6V (Page 14).

So what the VR does is tell the chip to change the VID according to the resistance? Is that what the BIOS/software would normally do (with a smaller window)?



Now where would I measure the voltage itself? biggrin.gif
post #14 of 41
think you can measure the vcore from the red circle, im not fully sure on this as Ive never used the card. Set 1.2v in windows and have a read on it and see if you get anywhere from 1.18v - 1.22v from there, than that's your read point

I should game.
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I should game.
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post #15 of 41
Thread Starter 
Quote:
Originally Posted by Rbby258 View Post

think you can measure the vcore from the red circle, im not fully sure on this as Ive never used the card. Set 1.2v in windows and have a read on it and see if you get anywhere from 1.18v - 1.22v from there, than that's your read point

Hmm... All four of those larger blocks are the same on mine, not 2+2 like on that picture:



Should I still measure on the spot you marked?




Also, What about fooling the power limitation as shown here? http://kingpincooling.com/forum/showpost.php?p=23414&postcount=3

And shorting pin 12 of the vGPU chip? http://www.overclock.net/t/1330361/gtx-670-reference-pcb-voltmod/0_50#post_18669486
post #16 of 41
Quote:
Originally Posted by Rayce185 View Post

As far as CrazyNuts says (The guy who made the KGB BIOS unlocker) the BIOS is locked to 1,212V. According to the VID chart, the chip should be able to push to 1.6V (Page 14).
That VID chart is just the possible values that the controller will do, it has nothing to do with what the core will actually be able to take and still survive.

Quote:
So what the VR does is tell the chip to change the VID according to the resistance? Is that what the BIOS/software would normally do (with a smaller window)?
Now where would I measure the voltage itself? biggrin.gif
The VR changes the resistance to ground at VFB, which lowers the voltage at VFB. This voltage is fed into the error amplifier inside the chip. When the voltage is dropped at the error amp, the output voltage is increased to compensate. By artificially dropping the voltage, we force the output higher thumb.gif
    
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post #17 of 41

Speed + voltage will still bring OCP though.. so if your benching and get black screen with voltage drop to 0.01v .. you know you've found the OCP current limit. Just power-cycle rig to correct and restore GPU.

 

**Doing VID mod [doesnt have to be so fancy as Tin's] will increase OCP limit along with GPUv

 

 

 looks like these guys got you off on the right foot biggrin.gif

post #18 of 41
Thread Starter 
Yeah you guys are awesome, thanks again! biggrin.gifthumb.gif
I'm fairly new to vmodding and had some basic electricity classes in school, but you guys have been really patient and helpful smile.gif


So I can't simply short pin12 as you proposed in the other thread to outsmart OCP?

I'm already using an unlocked BIOS, so the power target maximum is 150%. Does that mean that TiN's power limitation trick isn't needed?
post #19 of 41
Quote:
Originally Posted by Rayce185 View Post

Yeah you guys are awesome, thanks again! biggrin.gifthumb.gif
I'm fairly new to vmodding and had some basic electricity classes in school, but you guys have been really patient and helpful smile.gif


So I can't simply short pin12 as you proposed in the other thread to outsmart OCP?

I'm already using an unlocked BIOS, so the power target maximum is 150%. Does that mean that TiN's power limitation trick isn't needed?

shorting pin12 did not work on the other GPU tested.. 

 

as for power target.. its 'fake' .. reading is correct.. but OCP will inhibit you even getting that far typically with higher core speeds. If you have the ability to measure amperage on the 12v input...you would be able to read a rough current level..to see where its tripping. Its very important when testing OCP to use same core speed and volts.. as well as GPU test. 

 

*olpher in the the 670 thread, modded the current shunts that report current levels for power target.. he succeeded in modifying the levels and can see increase in power target range... but cannot increase due to OCP still tripping. There may be another way to fool the IC.. but would likely require several mods and resistance adjustments to other levels of the circuit...  which if your going to be going to that extent.. you may just want to VID mod and call it a day. wink.gif

post #20 of 41
I'm not gona be much help with OCP on these cards. Newest card I've worked on was a GTX 280, where everything was simple and nice tongue.gif

I'll have to read up on the other thread, there has to be a way to change it externally...
    
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