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Old January 25, 2009, 07:49 PM
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Default Voltmod HD4800 & GT200 through RivaTuner!

Any damage to your computer from this guide is your own fault. I take no responsibility!

I found this over at XS and thought there would be some users interested here as well. Pretty much, it lets you change the voltage of any GPU with a Volterra VT1103/VT1105/VT1165 voltage regulator. It has been confirmed to work with 4870, 4870X2, GTX280/260. Seems that no one has had any success with any 4850's so far though. But here is how to do it:

First, open command prompt (run, cmd) and browse to the RivaTuner folder. Now you will need two enter 4 commands, take note of which one(s) don't output "invalid" at the end of the prompt that comes up. Here are the commands:
Code:
RivaTuner.exe /ri0,70,1A 
RivaTuner.exe /ri1,70,1A 
RivaTuner.exe /ri2,70,1A 
RivaTuner.exe /ri3,70,1A
Take note of the /ri# and be sure you know which one doesn't output "invalid". For me it was /ri1. The prompt ended 0a for me, and seems to for everyone else.

Now, with that /ri# you just determined, enter the following commands:
Code:
RivaTuner.exe /ri#,70,15
RivaTuner.exe /ri#,70,16
RivaTuner.exe /ri#,70,17
RivaTuner.exe /ri#,70,18
Each of these should give a different two digit hex value. These are the different voltages of your GPU. To convert these hex numbers into the actual voltages, convert that hex number into decimal, and then use the following formula: (# * 0.0125) + 0.45 = voltage. Now use RivaTuner to see what your 3D voltage is, and remember the corresponding number (15,16,17,18). For me, they were all the same (42 in hex), so I changed each one.

Now, determine what the voltage you want, and plug it into the following formula: (voltage - 0.450)/0.0125=VID. Then convert that to hex.

Finally, you have to commit the new voltage values. Use the following command to do so:
Code:
/wi#,70,#,VID
The first # is the same as the /ri#. The second one is the 15/16/17/18. VID is the hex number you determined with the above formula. Now check RivaTuner, and the voltage should be set.

So far, people have done up to 1.6V with this, and higher is likely possible. For this to work as a pertinent voltmod, you can either create a .bat file that will run the final /wi command on every boot, or you can use RivaTuner's task scheduler, as the voltage is reset after Windows restarts

If you want to do this with CF/SLI, add /sd# (0-3) for each individual graphics card (4870X2 counts as a single card, as does a GTX295)

Here is a hex => decimal and a decimal => hex convertor:

joshhosler.biz/NumberOneInHistory/12/0630.htm
Hex to decimal converter

Using this, I successfully increased my 4870's voltage from 1.26 to 1.30V.

Here are the two threads from XS:
Tutorial: How to softmod to ANY VGPU you want without hardmods! (1.3~1.6v or more) - XtremeSystems Forums
and
Evga Voltage Tuner - Page 5 - XtremeSystems Forums

Good luck and happy modding!
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Last edited by CanadaRox; January 28, 2009 at 11:12 PM.
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Old January 25, 2009, 08:46 PM
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This is great, thanks a bunch Rox.

I'll do this tomorrow to my gtx 260. I upped it to 1.1875 with a bios mod, that's as high as that mod would go and I've been stable for 3 months at 837mhz. A cherry chip and now I'll see what it can really do.

Last edited by Squeetard; February 4, 2009 at 09:42 AM.
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Old January 26, 2009, 12:23 AM
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Hey Squee and CanadaRox you both on stock cooling?
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Old January 26, 2009, 08:21 AM
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I've got my 4870 watercooled, but if someone was crazy enough to run the 4870 fan at 100%, I'm sure the GPU would be cool enough for a little extra voltage. So far this appears to work with 4870, 4870X2, GTX 260 (vanilla and Core 216), GTX 280 and GTX295. It doesn't work on the GTX 285, nor does it work on 4850 or G92 based cards (at least not yet).
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Old February 4, 2009, 09:51 AM
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I'm on watercooling. This mod worked like a charm. Thanks heaps for the info Rox.

Before: Max bios overclock is 1.1875:


After: Set it to 1.3 with this command
"c:\progra~1\RivaTuner v2.20\rivatuner.exe" /wi3,70,15,44



Gonna push it to 1.4+ and see what this card can do.
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Old February 4, 2009, 05:41 PM
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Yea thanks for this!!
Im looking forward to playing with my cards again now.

BTW how do you oc 2 4870's in rivatuner past the 790 limit the 2nd card always seems to reset. Sure there is a way.
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