Hi there,
Recently found out how to do this and allows me to get 530 MHz Core giving me 8,3014 marks in 3DMark05. Before going any further it goes without saying that
YOU DO THIS AT YOUR OWN RISK
To do the BIOS mod, you will need the following:
a couple of floppy disks
NiBitor 2.5a
NvFlash 5.25
First you will need to make a backup of your bios just incase:
Create a bootable floppy disk and then copy nvflash.exe and cwsdpmi.exe to the same disk
Boot the computer from the floppy, and issue the command:
nvflash -b a:\oldbios.rom
This will extract a copy of your video card bios and put it onto the floppy disk as oldbios.rom
Before you continue, you should be aware of the risks involved
I cannot be held responsible for any mishaps you may have or damage you may cause to your card. Incorrect flashing of your card can render it inoperable, and leave you staring at a blank screen.
To minimise the risks, you should have an old spare pci graphics card and/or a floppy disk containing your original bios.
If anything should go wrong and you don't have a spare pci gfx card, then you can still do something known as a "blind flash"
To do a "blind flash" we add the following lines to the autoexec.bat file on the floppy disc containing your original backed up BIOS:
nvflash -r
nvflash -4 -5 -6 -A -y a:\oldbios.rom
This will flash the bios of the videocard without requiring any user input
Right, with the warnings out of the way...
Boot back into windows and open your bios file with NiBitor. You should see something similar to the following screen
Now comes the strange part, change the device id to read "Nvidia PCI-E 6800 Series GPU" and save the BIOS under a different name (eg. newbios.rom)
Open the new "newbios.rom" file and switch to the "Voltages" tab, place a tick in the "Extended Voltage Table" box
This allows us to select 1.5v as a 3D value
next we must clean up and correct the voltage table entries
the correct listing should be
after correcting the table entries, change the device back to read "Nvidia PCI-E 7800GT" and save your modded 7800GT BIOS
make yourself another bootable floppy disk and add the nvflash.exe, cwsdpmi.exe, and your newbios.rom file
reboot the pc with the floppy, and type
nvflash -r
nvflash -4 -5 -6 -A -y a:\newbios.rom
Once windows has loaded up successfully the mod is complete and should allow you to overclock much further than previous attemps, my card is optimally detected at 500/1.15, for the records, this does not increase the voltage going through the memory.
If you give it a go please let us know what overclock you get.
As far as i'm aware this DOES not work with GTX models.
Cheers,
Andy
Recently found out how to do this and allows me to get 530 MHz Core giving me 8,3014 marks in 3DMark05. Before going any further it goes without saying that
YOU DO THIS AT YOUR OWN RISK
To do the BIOS mod, you will need the following:
a couple of floppy disks
NiBitor 2.5a
NvFlash 5.25
First you will need to make a backup of your bios just incase:
Create a bootable floppy disk and then copy nvflash.exe and cwsdpmi.exe to the same disk
Boot the computer from the floppy, and issue the command:
nvflash -b a:\oldbios.rom
This will extract a copy of your video card bios and put it onto the floppy disk as oldbios.rom
Before you continue, you should be aware of the risks involved
I cannot be held responsible for any mishaps you may have or damage you may cause to your card. Incorrect flashing of your card can render it inoperable, and leave you staring at a blank screen.
To minimise the risks, you should have an old spare pci graphics card and/or a floppy disk containing your original bios.
If anything should go wrong and you don't have a spare pci gfx card, then you can still do something known as a "blind flash"
To do a "blind flash" we add the following lines to the autoexec.bat file on the floppy disc containing your original backed up BIOS:
nvflash -r
nvflash -4 -5 -6 -A -y a:\oldbios.rom
This will flash the bios of the videocard without requiring any user input
Right, with the warnings out of the way...
Boot back into windows and open your bios file with NiBitor. You should see something similar to the following screen
Now comes the strange part, change the device id to read "Nvidia PCI-E 6800 Series GPU" and save the BIOS under a different name (eg. newbios.rom)
Open the new "newbios.rom" file and switch to the "Voltages" tab, place a tick in the "Extended Voltage Table" box
This allows us to select 1.5v as a 3D value
next we must clean up and correct the voltage table entries
the correct listing should be
after correcting the table entries, change the device back to read "Nvidia PCI-E 7800GT" and save your modded 7800GT BIOS
make yourself another bootable floppy disk and add the nvflash.exe, cwsdpmi.exe, and your newbios.rom file
reboot the pc with the floppy, and type
nvflash -r
nvflash -4 -5 -6 -A -y a:\newbios.rom
Once windows has loaded up successfully the mod is complete and should allow you to overclock much further than previous attemps, my card is optimally detected at 500/1.15, for the records, this does not increase the voltage going through the memory.
If you give it a go please let us know what overclock you get.
As far as i'm aware this DOES not work with GTX models.
Cheers,
Andy
) and can get it upto 500/1200 with rivatuner, I am thinking of using this volt mod to squeeze that bit extra out of it.