Evga Voltage Tuner

[auchkoenig]

1.04 is idle v i think.

Also to people who say increasing v does not help:

i tried 810, 1620 shader and with 1.3 lots of art, 1.4 much less, 1.41 almost gone, 1.42 stable for 5 min.

also unlinking the shaders got me artifacts...

edit:
i tryed again to unlink shaders, and this time i left them at my stable 1566, and got to 810core (at 1.3V!) with no arti for 5 minutes. when i tried 810 and 1620 shaders i got arti. apparently my gpu is shader limited.

What program do you use to check for artifacts?

[drifter]

atitool and furmark

[jaredpace]

is it possible to change the voltage on GTX260 55nm Cards?

if it works on a 295 (two 55nm) it probably does

[auchkoenig]

atitool and furmark

Are planning to use 1.42 24/7? Is that even safe to go that high even for benching?

[Chri$ch]

if it works on a 295 (two 55nm) it probably does

i meant the rivatuner method...

[BababooeyHTJ]

Has anyone that thas tried this out noticed a higher vrm temp? Im wondering how much that I should give my chip (if any). I would like to break a 750mhz core. I can run 725 now stable.

[zlojack]

I hope they get this working for the GTX 285.

I was trying to decide between tri-SLI 285s or quad-SLI 295s and ended up going for the 285 (one for now, two more later on).

But this tool looks like it could push the 2 295s to the top over the three 285s unless the 285s can use this tool. For the lower price, the 295 quad-SLI becomes much more attractive with this tool.

[Extelleron]

1.04 is idle v i think.

Also to people who say increasing v does not help:

i tried 810, 1620 shader and with 1.3 lots of art, 1.4 much less, 1.41 almost gone, 1.42 stable for 5 min.

also unlinking the shaders got me artifacts...

edit:
i tryed again to unlink shaders, and this time i left them at my stable 1566, and got to 810core (at 1.3V!) with no arti for 5 minutes. when i tried 810 and 1620 shaders i got arti. apparently my gpu is shader limited.

Just curious, what was your stable OC at stock 1.2V?

I hope they get this working for the GTX 285.

I was trying to decide between tri-SLI 285s or quad-SLI 295s and ended up going for the 285 (one for now, two more later on).

But this tool looks like it could push the 2 295s to the top over the three 285s unless the 285s can use this tool. For the lower price, the 295 quad-SLI becomes much more attractive with this tool.

No amount of OC is going to give the GTX 295 Quad SLI setup 1GB of framebuffer - that is always going to limit it at high resolutions.

GTX 285 Tri-SLI is going to be much better overall than GTX 295 Quad SLI for 2560x1600 gamers. Certainly with AA enabled.

[zlojack]

No amount of OC is going to give the GTX 295 Quad SLI setup 1GB of framebuffer - that is always going to limit it at high resolutions.

GTX 285 Tri-SLI is going to be much better overall than GTX 295 Quad SLI for 2560x1600 gamers. Certainly with AA enabled.

Very true.

[SAE]

i meant the rivatuner method...

Nope, unless you got the Volterra-Controller. But I highly doubt that. Have a look at the end of your card and check what's written on the IC. My 285 has an Intersil IC:

[Chri$ch]

[computerpro3]

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

This works great for my 1st card in SLI, but how do I access the 2nd one?

[3oh6]

This works great for my 1st card in SLI, but how do I access the 2nd one?

http://www.xtremesystems.org/forums/...&postcount=106

working great for both my cards, haven't tried in SLI though. using this method to under-volt the crunchers and it has worked beautifully.

[computerpro3]

http://www.xtremesystems.org/forums/...&postcount=106

working great for both my cards, haven't tried in SLI though. using this method to under-volt the crunchers and it has worked beautifully.

Doh, missed the post.

But now I'm running into a very strange issue. I successfully can change the 2d voltages for both cards. But no matter what I do, I can't change the 3d voltages. I have tried writing to all 4 Ic2 bus numbers and still nothing.

EDIT: Nvr mind, figured it out

[3oh6]

won't be the IC2 bus numbers, the registers are for idle and load. 15,16,17,18, one will be idle, one will be load. for each card in the one rig with two cards crunching, they each had different registers for idle and load. perhaps thats what you meant but hope that helps.

[mikeyakame]

there should be 2 different I2C bus addresses for each cards VR if I'm not wrong. Unwinder is the man to talk to about this he could do it with his eyes closed standing on one hand while drinking a beer

[3oh6]

there should be 2 different I2C bus addresses for each cards VR if I'm not wrong. Unwinder is the man to talk to about this he could do it with his eyes closed standing on one hand while drinking a beer

nope, I2C BUS can be the same, you just have to specify the different devices. for instance, this is the line in my under volt config for two GTX 260s not in SLI for crunching...

/sd0 /wi3,70,16,2d /sd2 /wi3,70,18,2d

device 1 is /sd0, the other is /sd2...both on the fourth I2C BUS one using register 16 for load, the other card using register 18 for load voltage.

[[XC] riptide]

hmmm. I wonder can I use all this for my 8800 GTX? Must see does it have Voltera IC's. Regardless I ran
RivaTuner.exe /ri0,70,1A
RivaTuner.exe /ri1,70,1A
RivaTuner.exe /ri2,70,1A
RivaTuner.exe /ri3,70,1A.

All invalid, for kicks I ran RivaTuner.exe /ri4,70,1A. Screen went white. Restart and it was fine.... *sigh*

[[XC] riptide]

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.

Probably not on G80 either.

[SAE]

[IMG left out]

Weird IC, huh? Looks like "relabeled"

[nafets]

Rivatuner voltage adjustment works perfectly with my reference HD4870 512MB. Both overvolting and undervolting is fully functional. Awesome.

[STaRGaZeR]

Rivatuner voltage adjustment works perfectly with my reference HD4870 512MB. Both overvolting and undervolting is fully functional. Awesome.

+1, tomorrow is going to be funny

[computerpro3]

I got it working but when both GPU's are set at 100% fan and 1.2v, I get hard locks when overclocking to speeds that are known good with stock volts. The strange thing is that if I only raise the voltage of 1 gpu at a time, I'm fine. I'm wondering if I'm starting to run into power issues - I'm using a Zippy 700w with only 45w on the 12v line, and have 2 GTX 260 Core 16's, an E6850 @ 3.8ghz 1.45v, 4gb ram, 3 hard drives, 9 fans, etc. The 12v line measured with a multimeter is 12.09 idle and 12.08 under load, but still I'm starting to wonder.

I guess it doesn't matter since I have 2x GTX 285's coming soon via step up, but if I'm having power issues with the GTX 260's, I'm certainly going to have them with the 285's. The psu is running at basically ambient temperature due to a dual fan mod on it, but still...

I figured being a zippy I would be okay, but I guess not.

[Bo_Fox]

Rivatuner voltage adjustment works perfectly with my reference HD4870 512MB. Both overvolting and undervolting is fully functional. Awesome.

My gosh, are you serious? How much does it help you overclock your 4870 over stock volts overclocking? How much are you able to overvolt it?

I'm so tempted to buy it right now just because of this... (at least, if it can reach 850-900 MHz without hardware v-modding) Is there another thread on this RT voltage adjustment tweak?

[nafets]

My gosh, are you serious? How much does it help you overclock your 4870 over stock volts overclocking? How much are you able to overvolt it?

I'm so tempted to buy it right now just because of this... (at least, if it can reach 850-900 MHz without hardware v-modding) Is there another thread on this RT voltage adjustment tweak?

I've just been messing around with the under/overvolting. Down to 1.0v and up to 1.4v, so far, with confirmed lower and higher power draw from the wall. Don't have a DMM. Still seeing what the limits are though.

Haven't done any overclocking with the new voltages yet.