Evga Voltage Tuner

[justageek95]

Why do you try to write to register 1A instead of those mentioned in the article? Register 1A is a hardwired read-only VRM model identification register. Value 0A, which you read from this register is VT1165 Model ID, you cannot (and not supposed to) re-program it.

Thanks for the help, I got it to work by /wi3,70,17,3c

[drifter]

justageek95 how did you get it to work?
i read the article and tryed the things you have tried but nothing happened

[justageek95]

DISCLAIMER: I TAKE NO RESPONSIBILITY FOR ANY DAMAGE THAT MAY HAPPEN IF YOU DO THIS!

1. Find the I2C bus of your card by running the following CLI commands:
RivaTuner.exe /ri0,70,1A
RivaTuner.exe /ri1,70,1A
RivaTuner.exe /ri2,70,1A
RivaTuner.exe /ri3,70,1A
Three of these four commands will return "invalid" take note of the one that doesn't (for me it was /ri3,70,1A)
This will find the I2C bus (highlighted in red in my example)

2. Get your voltage register values
Using the I2C bus number found above, (0-3, highlighted in red) run the following CLI commands, replacing "#" with the I2C bus number.
RivaTuner.exe /ri#,70,15
RivaTuner.exe /ri#,70,16
RivaTuner.exe /ri#,70,17
RivaTuner.exe /ri#,70,18
Take note of the return value for each.

3. Convert voltage register values to actual voltage
For each of the values returned in step 2 do the following:
A. Convert the value to decimal format (the returned values are in hexidecimal)
B. Calulate actual voltage by the formula: voltage = (VID * 0.0125) + 0.45
C. Compare the 4 resulting actual voltages to the voltage reported in 3D mode in Rivatuner hardware monitoring.
D. The closest value should be your 3D voltage (ex: for me Rivatuner showed 1.13v, I got 1.250v
E. Take note of the register that is associated with that value. (highlighted in red in step 2)

4. Calculating the voltage to use
A. Decide what voltage you want to set.
B. Find the VID for that voltage using the formula VID = (voltage - 0.450) / 0.0125
C. Convert the VID to hexadecimal

5. Setting a new voltage
You can set the voltage by writing the new VID in hexadecimal form to the register.
A. Run the CLI command: (replace # with IC2 bus number, and VID with the VID in hexadecimal form)
RivaTuner.exe /wi#,70,17,VID

The new voltage should now be set!



Example: GTX 260, desired voltage = 1.2v

1. All the commands return "invalid" except RivaTuner.exe /ri3,70,1A which returns "0A"

2. I get the following values:
RivaTuner.exe /ri3,70,15 returns 3B
RivaTuner.exe /ri3,70,16 returns 31
RivaTuner.exe /ri3,70,17 returns 36
RivaTuner.exe /ri3,70,18 returns 2F

3. Calculating the voltages of each:
Hex: Decimal: Voltage:
3B......59......1.1875v
31......49......1.0625v
36......54......1.1250v
2F......47......1.0375v
Rivatuner was reporting 1.13v in 3D mode so the third one is my 3D voltage register.

4. I wanted 1.2v so:
VID = (1.2 . 0.45) / 0.0125 = 60
60 = 3C in hexadecimal

5. I set the new voltage by running:
RivaTuner.exe" /wi3,70,17,3C

[drifter]

TX man!
works on my gtx 280

http://www.easycalculation.com/decimal-converter.php
http://www.maxi-pedia.com/hex+to+decimal+converter

hex to dec and dec to hex converters

edit: does anyone know how to get it running at rivatuner/pc startup?

[auchkoenig]

It working on my GTX280 too but I have a question though. The given cli only change the VID for gpu0, how do I change the VID for gpu1 since im using SLI.

I tried checking the diagnostic report. The only difference between the two GPU is one is on

$0000000003 Location : bus 2, device 0, function 0

and the other one is on

$0000000003 Location : bus 3, device 0, function 0

My guess is that i need to change the deviceid, am I correct?

[Unwinder]

It working on my GTX280 too but I have a question though. The given cli only change the VID for gpu0, how do I change the VID for gpu1 since im using SLI.

You should apply changes to both GPU VRMs. CLI works with GPU selected in the main tab of RivaTuner. There is /sd<device_index> or /selectdevice<device_index> command allowing to change device selection via CLI. <device_index> is 0-based logical display device index, i.e. if there are 4 virtual display devices (2 heads representing independent displays for the primary GPU and 2 more heads for the secondary) then your should select the first (0) then the third (2) logical devices when applying the changes. In this example, command line for probing VRMs of both GPUs can look like:

RivaTuner.exe /sd0 /ri3,70,1a /sd2 /ri3,70,1a

[drifter]

i have little experience at writing scripts, can someone help to write up a script to adjust the vgup (just for one vr) at windows startup?

[DMH]

I've tried to that running cmd.exe and doing what you say but all ways it's not a known command either internal or external

[Unwinder]

edit: does anyone know how to get it running at rivatuner/pc startup?

RivaTuner's task scheduler module was designed special for such tasks. Go to <Scheduler> tab, click <Add new task> button and type in task name, e.g. "Voltage mod", select <Launch application on specified schedule> task type in %RT% macro as path (RivaTuner will expand it into fully qualified path to itself when executing) and desired I2C writec commands in the command line field then selct desired schedule type, e.g. <Run task at RivaTuner startup>.

[XSAlliN]

DISCLAIMER: I TAKE NO RESPONSIBILITY FOR ANY DAMAGE THAT MAY HAPPEN IF YOU DO THIS!

1. Find the I2C bus of your card by running the following CLI commands:
RivaTuner.exe /ri0,70,1A
RivaTuner.exe /ri1,70,1A
RivaTuner.exe /ri2,70,1A
RivaTuner.exe /ri3,70,1A
Three of these four commands will return "invalid" take note of the one that doesn't (for me it was /ri3,70,1A)
This will find the I2C bus (highlighted in red in my example)

2. Get your voltage register values
Using the I2C bus number found above, (0-3, highlighted in red) run the following CLI commands, replacing "#" with the I2C bus number.
RivaTuner.exe /ri#,70,15
RivaTuner.exe /ri#,70,16
RivaTuner.exe /ri#,70,17
RivaTuner.exe /ri#,70,18
Take note of the return value for each.

3. Convert voltage register values to actual voltage
For each of the values returned in step 2 do the following:
A. Convert the value to decimal format (the returned values are in hexidecimal)
B. Calulate actual voltage by the formula: voltage = (VID * 0.0125) - 0.45
C. Compare the 4 resulting actual voltages to the voltage reported in 3D mode in Rivatuner hardware monitoring.
D. The closest value should be your 3D voltage (ex: for me Rivatuner showed 1.13v, I got 1.250v
E. Take note of the register that is associated with that value. (highlighted in red in step 2)

4. Calculating the voltage to use
A. Decide what voltage you want to set.
B. Find the VID for that voltage using the formula VID = (voltage - 0.450) / 0.0125
C. Convert the VID to hexadecimal

5. Setting a new voltage
You can set the voltage by writing the new VID in hexadecimal form to the register.
A. Run the CLI command: (replace # with IC2 bus number, and VID with the VID in hexadecimal form)
RivaTuner.exe /wi#,70,17,VID

The new voltage should now be set!



Example: GTX 260, desired voltage = 1.2v

1. All the commands return "invalid" except RivaTuner.exe /ri3,70,1A which returns "0A"

2. I get the following values:
RivaTuner.exe /ri3,70,15 returns 3B
RivaTuner.exe /ri3,70,16 returns 31
RivaTuner.exe /ri3,70,17 returns 36
RivaTuner.exe /ri3,70,18 returns 2F

3. Calculating the voltages of each:
Hex: Decimal: Voltage:
3B......59......1.1875v
31......49......1.0625v
36......54......1.1250v
2F......47......1.0375v
Rivatuner was reporting 1.13v in 3D mode so the third one is my 3D voltage register.

4. I wanted 1.2v so:
VID = (1.2 . 0.45) / 0.0125 = 60
60 = 3C in hexadecimal

5. I set the new voltage by running:
RivaTuner.exe" /wi3,70,17,3C

Good posting!

[jaredpace]

Holy smokes, here is the answer to the ultimate VGPU BIOS mod everyone's looking for.

Does this work on G92 cards?

[003]

And I won't like to give new sharp axe like _easy_ voltage control to these users, sorry. That's my responsibility and my choice

Well I see where you're coming from. But there are a bunch of things you could do to make sure you got the message across. For example, the first few times you go to the voltage adjustment page, it could pop up a very explicit warning of the danger and potential damage that may result, and this message could be programmed to display for 3 minutes, with no way to bypass it (the first few times at least).

Surely, that would alert any potential user to the damage they may cause, no?

And about asking. Ok, is it possible to adjust the memory voltage, and if so, how? Any other major voltages that could be modified?

[BenchZowner]

Ok, is it possible to adjust the memory voltage, and if so, how? Any other major voltages that could be modified?

That depends on the PWM controller used for the memory.
If I recall correctly the memory is "powered" by another PWM Cont. on the VGA, so you have to check which controller is being used on your card ( I'm not 100% sure but I think I've seen some GTX 280s with different PWM Cont. for the memory ) and if it supports VID setting via the I2C BUS.

[Biker]

Very interesting

Now to blow up my 280

[largon]

...and now everybody knows why I quit messing with that stuff years ago. The ammount of time you will spend trying to figure it out, you could've already had the mod done and working with just a basic understanding of electronics and soldering.

Actually, no.
A soldered mod WILL be handicapped by OVP because there is no OVP mod as we don't even know how VT1165 does OVP as the datasheet is under NDA. Software VID change (via Rivatuner, eg.) just "bypasses OVP".

Does this work on G92 cards?

Reference G92 boards use the Primarion PX3544, of which Primarion says the following:

The PX354x incorporates an industry standard I2C-bus serial interface for control and monitoring. Through the serial interface, the power supply designer can quickly optimize designs and monitor system performance. The interface allows the PX354x to provide digitized information for real time system monitoring and control.

http://www.primarion.com/PrimarionMa...wer_PX3540.htm

->

[SAE]

Great job, guys!
Maybe some mod should split up this thread in two and put the last part in the modding section.

...Unfortunately my GTX 285 has another brand/type of controller on board (obviously the cause for delays with those 55nm cards):

[CryptiK]

Here's the data sheet for the intersil chip on your GTX 285 http://www.intersil.com/data/fn/FN9276.pdf

Maybe different companies use different chips on these too.

Unless OVP/OCP kicks in early I'd still prefer to hard mod.

*EDIT - OVP or OCP apparently kicks in at 1.30v, so hard mod will be next to useless without OVP/OCP mod also.

[Andi64]

Hi!
Thanks Justageek, very good info!
Check at the guide, in part 3B. The correct formula for voltage should be:

Voltage = (VID * 0.0125) + 0.45

I'm trying this with my HD4870. Just to check if it applies.

rivatuner.exe /ri1,70,1a returned I2C 01 70 1a : 0a, the other three were "invalid".

The problem is that every register (15,16,17,18) returns 41. Wich in fact it is my actual Voltage.

v = (65 * 0.0125) + 0.45
v = 1.2625

And I think it is correct, because I edited the BIOS so there is no energy-saving mode, it's allways at full speed.

But there isn't a different value for the other registers until I get to... 45, for example, that returns 5E... and that will set 1.65V.
Question is, wich are valid register? Can I set whatever register I want that returns a valid voltage value?


Sorry for my English!

[Revv23]

TBH I think a warranty on non PCB damaging volt mods is better, some people shouldn't be raising the voltage on their cards, subsequently these are these are the people that are incapable of volt modding on their own. EVGA is digging a deep grave for RMA's by releasing this kind of functionality to the general public. ( like the guy who says 1.063 to 1.263 is only a small amount of voltage )

You really think so?

#1 that is a small increase in voltage

#2 you could say the same thing about motherboards that offer voltage that could potentially kill hardware (see: all enthusiast mobo's)

I think people that tweak will use this and people that don't won't even know they have the feature. Just as it has always been with pc hardware.

[jaredpace]

Great job, guys!
Maybe some mod should split up this thread in two and put the last part in the modding section.

I put a thread here in Xtreme BIOS, but i think it needs to be moved to Xtreme Mods:

http://www.xtremesystems.org/forums/...d.php?t=215521

[GoldenTiger]

DISCLAIMER: I TAKE NO RESPONSIBILITY FOR ANY DAMAGE THAT MAY HAPPEN IF YOU DO THIS!

1. Find the I2C bus of your card by running the following CLI commands:
(snip)

Awesome job... I had a feeling that calculation in there wasn't arbitrary, but I hadn't known really what to do with it. Thanks for the great writeup.

[Luka_Aveiro]

Reference G92 boards use the Primarion PX3544, of which Primarion says the following:


->

So it happens to be theoretically possible to use such method in order to adjust voltage in G92?

Holy shhhhhhhhhhhh!

Well, i think in order to do so we would need something similar to VT1165 Model ID but that actually works with G92, right?

[largon]

I just tried it on my PX3544-chipped G92GTS but I can't seem to find a i2c bus (0-99) that doesn't slap me with "invalid".

[Luka_Aveiro]

I just tried it on my PX3544-chipped G92GTS but I can't seem to find a i2c bus (0-99) that doesn't slap me with "invalid".

Is it because rivatuner needs something similar to VT1165 Model ID but working with G92 PX3544?

i think it does, because i can't read voltages with RT hardware monitoring... If you can't even monitor, how will you be able to adjust?

[mikeyakame]

It only works on cards with Volterra VT11xx digital voltage regs, NV GTX260 65nm GTX280 65nm ATI HD4870 4850? and a few other cards.

It doesn't work on any G92 cards from what I can recall because none of them were built with Volterra regs.

If you aren't even sure what voltage regulator is on your graphics card then you probably shouldn't be playing with I2C bus commands unless you know what you are doing.