My 8800GT barely overclocks at all :(

Originally Posted by LordBritish

How do u do this voltmod?

I need instructions that a chimp can follow.

Here's what I did, took 10 minutes:

1) Created a bootable floppy using this, just run in windows with floppy in drive: Bootable Floppy Maker or the main site bootdisk.com

2) Download and run this, .nvFlash 5.57 from here mvtech page for nvFlash 5.57, it unzips to two files. Run the nvFlash.v5.57.exe file and it unzips again. Drag files (cwsdpmi.exe, nvflash.exe) from the last unzip directory onto floppy

3) Reboot PC with floppy in drive, set floppy as first boot device in BIOS. The A:\ prompt shows up.
You will type: "nvflash --save orig.rom" (that's a double dash, and the file name orig.rom is your original video bios being saved)

4) Eject the floppy and reboot into windows. Re-insert floppy and copy orig.rom to somewhere you can find it later.

5) Download and install NiBiTor 3.6 from here mvtech NiBiTor 3.6 page

6) Run NiBiTor, got to menu File>Open BIOS and select your orig.rom. Navigate to the 'Voltages' tab, then 'Exact Mode' tab. In the drop-down for 'Extra' select 1.1V.

7) Got to menu File>Save BIOS and create a new name like voltmod.rom. Exit NiBiTor and copy your voltmod.rom to the floppy.

8) Reboot PC with floppy inserted and you're back to A:\. Type "nvflash voltmod.rom" . It will ask you if you're sure, so make up your mind and type Y if you are sure. When it's done eject the floppy and reboot.

9) Retry overclocking beyond your previous limit.


My advice is to read the other links provided by sam0t and then use this chimp list as a reference for our particular voltmod. You can also edit the Clockrates tab to put your safe overclock permanently into the BIOS so rivatuner isn't always running. Up to you. Good Luck.

Thx for those simple instructions.

I did the VoltMod !!

So simple, a caveman can do it!



I don't have results yet but preliminary testing shows that temps are higher which means the voltage has increased.

Exactly, my idle temp went up 4 degrees C.

Let us know your max clocks...

OK, I got some results it but they're not final

710 Core, 1730 shader, 950 mem was error free in ATI tool for 8+ hours.

Now trying for 740 Core, 1750 Shader - it's running as I type so we'll see how it does.

You really should overclock each one independently so you know what is causing the problem when you get it.

thats a decent oc.. some cant handle higher then that becuase of the memory just doesnt oc well, yet others can hit a higher oc on the mem..

Just did this and OC'd to:

760/1800/2050

are you guys using ati tool to check to scan for artificats after o/c?

Without voltmod I can only push my card to 702/1728/950 without any artificats, you make me jealous I'm tempted to do it, but I don't want to void my lifetime warranty. S1 is on the way so I'll try again to o/c once again once I install it.

Yup, I run ATITool to check for stability. It's a soft voltmod so it won't void your warranty...

Originally Posted by jonjon0nline

Yup, I run ATITool to check for stability. It's a soft voltmod so it won't void your warranty...

Are you sure? WHat happens if you video card goes dead (with softmod/voltmod) and you send it to XFX/EVGA? I'm pretty sure they will know that the card was softmoded, which would void the warranty? am I missing something? Perhaps I'll start a new topic on this.

Great Instructions

You think your card is a dud, I spent huge bucks on my 8800 Ultra that won't even do above 650mhz without issues. Talk about a cock in the mouth. The Ultra's are pretty much guaranteed late 600's to early 700's on the core. Not mine.

I have just volt mod my card and my temps have not even risen by a degree (I am using a S1 Arctic Cooler with turbo fans), yet my overclocks and temps are stable at:





I plan to nail over 800 core and push the shader past 1900.

Here is a 3dmark06 benchmark all on air with the new settings:

My Palit 8800gt (stock cooler) is idle=53, load=75C (60% fan). Riva tuner is used to control temps.

I used ATi tool and tested for about 15 minutes to find a max core. it could barely break 700. Memory overclock is fine, around 1010.

today i ran FEAR @ 670/970 but it crashed. I ran crysis at those #'s but it was fine.

So, i've read overclocks of 25% for the GT but using after market coolers. Should i EXPECT better overclocks if i replace the cooler? Is it the heat that's holding back the overclock? Are GT's like intel cpu cooling..that some ppl get lucky, some don't?

Quick question, how exactly can you tell if your voltmod worked? I mean I followed Staypuft's instructions as well as Blue Falcon's BIOS flash with a USB (http://www.hardforum.com/showthread.php?t=1260590) yet after I typed in "nvflash voltmod101.rom" (the file name with volt at 1.1v) it just asked me to push enter multiple times until it went back to C:\. Not knowing if it worked or not I tried to overclock my card higher then its previous value yet I was unable too (artifacts were scene within seconds). Thinking I did not do it correctly I booted from USB once again and again typed in nvflash voltmod101.rom" but this time an error showed up. I tried typing it once again and the same error popped up. So I typed in "orig.rom" and it asked me to confirm whether I wanted to switch back and I just typed in "n".

So I will try to repeat the whole process again and whether I get it to work or not, is it possible what voltage your gpu is running at?

Edit*: After reverting back to original BIOS and repeating the entire process all over again, I got it to work! It asked me if I wanted to revert to this new settings and I said yes. Unfortunately, when I tried to overclock higher, instead of being able too overclock higher, it seemed like I was unable to even reach my old highest overclock! I mean I have a 8800gt scc (already at 700/1728/1000) and was able to overclock it to 761/1859/1079 (I have an accelero s1 as well as the turbo module on) and was able to run it on ATITool for 5 min with no errors or artifacts (I only ran for 5 min because wanted to see if it was stable enough to the point where I could run 3dmark06 succesffully then move on higher, past 761/1859/1079, any increase would result in 3dmark06 freezing up). I also only got my accelero s1 yesterday so i have only been able to seriously try to overclock it yesterday (I also had two midterms yesterday... so couldn't exactly spend alot of time on overclock) and so haven't really had the chance to run ATITool for a few hours. Before the BIOS flash, at 771, I would receive an error/artifact in about 20 sec. After the BIOS flash, at 771, I would receive an error instantly. I checked to make sure that I set 1.1v and I did.

Is there a particular reason why after the BIOS flash I cannot overclock as high as before it? I mean is there any way I can check my gpu voltages so I can check the voltage before the flash (the original BIOS) and after the 1.1v flash?

It's really luck of the draw.

I have a BFG OC2 that will do 740/1860/1050 out of the box with no problems, and that is before the bios volt mod which I haven't even tried on this card. I also have an XFX Alpha Dog that wouldn't even do 675 core without the volt mod. With the volt mod, 720 is about the maximum it will handle. I have heard of EVGA SC's that do 790/1080 out of the box but those are very hard to find, it's very random. Every card is different. The only guarantee you get is that it should run at the speeds it comes with from factory or you should return and RMA.

And a note to those flashing bioses...you are supposed to use nvflash.exe -4 -5 -6 newbios.rom
If your card doesn't boot after flashing, have a PCI card handy or integrated video to boot from so you can flash your original bios back.

Originally Posted by known12345

Quick question, how exactly can you tell if your voltmod worked? I mean I followed Staypuft's instructions as well as Blue Falcon's BIOS flash with a USB (http://www.hardforum.com/showthread.php?t=1260590) yet after I typed in "nvflash voltmod101.rom" (the file name with volt at 1.1v) it just asked me to push enter multiple times until it went back to C:\. Not knowing if it worked or not I tried to overclock my card higher then its previous value yet I was unable too (artifacts were scene within seconds). Thinking I did not do it correctly I booted from USB once again and again typed in nvflash voltmod101.rom" but this time an error showed up. I tried typing it once again and the same error popped up. So I typed in "orig.rom" and it asked me to confirm whether I wanted to switch back and I just typed in "n".

So I will try to repeat the whole process again and whether I get it to work or not, is it possible what voltage your gpu is running at?

Edit*: After reverting back to original BIOS and repeating the entire process all over again, I got it to work! It asked me if I wanted to revert to this new settings and I said yes. Unfortunately, when I tried to overclock higher, instead of being able too overclock higher, it seemed like I was unable to even reach my old highest overclock! I mean I have a 8800gt scc (already at 700/1728/1000) and was able to overclock it to 761/1859/1079 (I have an accelero s1 as well as the turbo module on) and was able to run it on ATITool for 5 min with no errors or artifacts (I only ran for 5 min because wanted to see if it was stable enough to the point where I could run 3dmark06 succesffully then move on higher, past 761/1859/1079, any increase would result in 3dmark06 freezing up). I also only got my accelero s1 yesterday so i have only been able to seriously try to overclock it yesterday (I also had two midterms yesterday... so couldn't exactly spend alot of time on overclock) and so haven't really had the chance to run ATITool for a few hours. Before the BIOS flash, at 771, I would receive an error/artifact in about 20 sec. After the BIOS flash, at 771, I would receive an error instantly. I checked to make sure that I set 1.1v and I did.

Is there a particular reason why after the BIOS flash I cannot overclock as high as before it? I mean is there any way I can check my gpu voltages so I can check the voltage before the flash (the original BIOS) and after the 1.1v flash?

You're doing something really very wrong. nvflash should show your graphics adapter and the current bios and the one you want to replace it with. It should ask you if you want to continue, you hit Y and the progress bar will appear with a few dots until finished. See http://br.youtube.com/watch?v=GqWpiWUJte4. Personally I'm not a big fan of booting via USB, I still keep a floppy around because it is still useful for so many things.

Are you using somebody else's bios intead of editing your own with nbitor??? Are you putting the 1.1v in the extra row?

A BIOS mod most DEFINITELY WILL void your warranty. It's no different really to a solder/wire mod. Whether they'd be able to detect it or not if the card actually dies, who knows, but if it at all boots, ie: massive visual corruption or something -- well then you're SOL.

I'm wondering about all of this vmod junk since I can OC over my factory oc by a little, and go artifact free in atitool and that one fur rendering stress test, but often times in games like CoD4 and GoW I get the dreaded 'red dots/snow' and the lock up, I'd assume a stress test would be far more demanding than some random fps, but in-game is the only time I ever get massive lockups and crashes.

I think it's the RAM as most of the lockups occur when RAM is close to 2000mhz (up from 1900 factory), but would the vmod improve my RAM's stability or am I SOL due to ram limitations (supposedly)?

Oh ya, I have aftermarket cooling (check sig).

Anyone knows if this can be done to the GTS g92 core?

If yes, then what voltages do we have to set it too? Whats the default voltage?

If your card artifacts at lets say 700 core then increasing the voltage will make those artifacts go away?