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6800 vGPU Mod

post #1 of 6
Thread Starter 
Now to increase the voltage on a 6800 you just flash a new value to the BIOS correct? Is there a need for a actual hardware mod or can it just be done by the BIOS?
post #2 of 6
Some motherboards will allow you to change your voltage in your video card, but most voltage mods will be done with hardware, using a pot, solder, and a steady hand. Don't forget you'll need a multimeter
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TheGibson
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post #3 of 6
No, the 6xxx series can be voltmodded via a BIOS flash (the new 7xxx series can't do that, and only can be hardmodded). I will find you a post I made a few days ago, hold on.

Edit:: Follow these procedures:
This process does not require any physical effort nor soldering mods. All you have to do is have a bootable Floppy Disk. You simply insert floppy disk, format it to make it reboot, download Nibitor and NV Flash. Copy NV Flash to the bootable floppy disk and restart the PC (with floppy inside). The PC will start and just type "nvflash -backup.rom" to backup your existing gfx card BIOS. Now boot into Windows and edit that BIOS (from floppy) with Nibitor and from there you can change the voltage that you would like. Save the edited BIOS to the floppy and reboot again. This time type "nvflash -4 -5 -6 file.rom" where "file" is the edited file name that you saved as. Reboot and you're done!
post #4 of 6
Supposidly you can flash it after editing the bios with nibitor, except when i did this it would cause the computer top lock up from giving it too much voltage. Im waiting for an update to come out for smaller voltage increases so i can do it again and really OC this sucker! Youll also need better cooling before doing ANY voltage mods.
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post #5 of 6
I firmly agree with basil, first get some nice cooling. Videocards are like cpu's with stock heatsinks, only videocard makers try and use the bare minimum to get bye.

I really don't trust flashing a bios enough to use it to change voltage. I would use a hard mod instead. But thats just my opinion.
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post #6 of 6
Thread Starter 
Guys, I'm water cooled. So no worries there! I changed the voltage from 1.4 to 1.55 and that alone increased my 3DMark2001 score from ~19,500 to ~23,500. I won't be home until Tuesday, but I will post the before and after screenies then. I am going to try 1.6, 1.65, and finally 1.7. I hear 1.7 is the farthest you want to go unless you have phase or chilled water. After this is complete, I will do the hardware Memory Voltage mod. I have all the documentation for that. I want to get to around 2.25-2.5v. I will install active cooling (slot blower) to keep the mem chips cool if I do that. The card is already unlocked to 16/6, I got lucky, mine came out of the box that way. And with 1.4v on the GPU I was getting excellent performance, but I just want to see what I can make this thing do. Thanks for all the feedback so far!

EDIT: Basil, the newest nibitor allows for .5v voltage increases. Check it out.
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