Really easy VGpu/Vddr mod 6800GS / 7800GT (No soldering!)

Works with 6800GS and 7800GT. If someone who doesn't like to solder want to do voltage mods, here is your chance.


Vgpu is easy to do with conductive paint. I have to discover more voltages later. It's +32 Celsius out there, so I'm not going to be indoors :)

Here is how you do it. Yellow increase core voltage 0.05V and red 0.1V. So if original 3D voltage is 1.4V (6800GS) it will be 1.4 / 1.45 / 1.5 / 1.55V

Attachment 49026

Memory mod might be old news. Just stick wires in these holes and you are ready.

Attachment 49027

Enjoy! :toast:

This is great, since I'm a little shakey with the soldering iron :(. One question, if I do this with the 1.5v bios mod, does that add up to 1.6v?

So the 6800GS and 7800GT have the same pcb layout?
Awesome guide. I too would like to know about using this with the 1.5v bios mod.
Also, could you elaborate a little on how to do the mem vmod? thanks

i'm guessing if you use the softmod (1.5v) then you'll have the options of 1.5, 1.55, 1.6, 1.65 V

Do these increase voltages in 3D mode only, or 2D mode as well?

I'll do this in a week or two, when I flush out my water cooling system. The cpu block has been blocked up with god knows what, and the water is murky...

For even more laziness for the vddr, you can do this:
http://img130.imageshack.us/img130/6578/vmem1qz.jpg
Pencil resistor marked down to 590 ohms, yielding 2.2 volts (I think.)

I've already done the pencil mod on the mem, but I'm looking to add more volts to the gpu. I've done the 1.5v bios gpu mod, but I think I'll use this mod to raise it to 1.6v.:cool:

Quote:

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Originally Posted by hardnrg

i'm guessing if you use the softmod (1.5v) then you'll have the options of 1.5, 1.55, 1.6, 1.65 V

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Somebody with 7800GT must try this. I haven't heard that 1.5V bios mod would work with 6800GS.

Quote:

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Originally Posted by Celcius

So the 6800GS and 7800GT have the same pcb layout?
Also, could you elaborate a little on how to do the mem vmod? thanks

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The pcb is same. Only different core in these cards.

Mem mod is simple: just stick wires in the holes marked (TP 504 and TP509) and thats it. Of course you can glue them on. Check that there are no bended wires and wires doesn't touch anything else on the other side of the pcb.

Just to make sure I understand before I do this to my $300 card:

When you say stick wires in the holes, do I

A. Take a single wire and stick an end in each hole, thus connecting the two holes

or

B. Take two wires and stick one in each hole?

I'm thinking it's A, but better to ask then have a dead card.;)

Quote:

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Originally Posted by Celcius

Just to make sure I understand before I do this to my $300 card:

When you say stick wires in the holes, do I

A. Take a single wire and stick an end in each hole, thus connecting the two holes

or

B. Take two wires and stick one in each hole?

I'm thinking it's A, but better to ask then have a dead card.;)

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:slobber: It's good that you asked this before doing it.

Here is how you do it properly. Connect variable resistor (20K ohm or 10K ohm) with wires in these two holes. Tune down to increase voltage. Default voltage is 2.0V and with 10K ohm vr = 2.2V
Attachment 49171

I hope this mod is more clear now :)

Yes, thanks:)

LoL wish I had known this mod earlier, would've saved 1 card from dying rofl... ah well I have a 7900GT now...

Works this mod on 6800GS 512MB Cards?

Quote:

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Originally Posted by DoDo1

Works this mod on 6800GS 512MB Cards?

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No I don't think so. The pcb is different. I haven't seen those 512MB cards, so I can't say nothing :(

Look in my Thread there are some pics of my card but no one can help me.
http://www.xtremesystems.org/forums/...d.php?t=104628

Look this:
http://www.xtremesystems.org/forums/...ad.php?t=98874

You can do same mods with your GS.

Are you 100% sure? I compared the pics from the card and i think they are the Same pcb.

Quote:

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Originally Posted by SF3D

Works with 6800GS and 7800GT. If someone who doesn't like to solder want to do voltage mods, here is your chance.


Vgpu is easy to do with conductive paint. I have to discover more voltages later. It's +32 Celsius out there, so I'm not going to be indoors :)

Here is how you do it. Yellow increase core voltage 0.05V and red 0.1V. So if original 3D voltage is 1.4V (6800GS) it will be 1.4 / 1.45 / 1.5 / 1.55V

Attachment 49026

Memory mod might be old news. Just stick wires in these holes and you are ready.

Attachment 49027

Enjoy! :toast:

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can you upload the pictures again pls, they dont work.

my 7800gt is at 1.5v via bios mod, but i cant be sure that it worked, so i need the measuring points to check. if it is at 1.5 then i guess it would only really be wise to goto 1.55v

Here's the pic:

http://img429.imageshack.us/img429/2802/nimetnlp3.jpg

Glad I saved it.

thanks!!! did you also figure out if this mod gives you over 1.6v if you did the bios mod as well ?

anyone know what the vgpu readpoints are ?

Here.

Attachment 49411

Quote:

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Originally Posted by zipp0r

thanks!!! did you also figure out if this mod gives you over 1.6v if you did the bios mod as well ?

anyone know what the vgpu readpoints are ?

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No... I turned on the pc to find it artifacting heavily. I'll RMA it eventually...

Quote:

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Originally Posted by couppi

No... I turned on the pc to find it artifacting heavily. I'll RMA it eventually...

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after doing this vmod? or before doing it ?

Quote:

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Originally Posted by zipp0r

after doing this vmod? or before doing it ?

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Right before I did it. I fired up 3dmark06 to record my score, and it artifacted heavily. It's been a while since I've played any games. It's the summer, so I don't have the stress of school or anything. A few days later it died pretty much completely. I don't plan on keeping my replacement, though. I'll probably sell it, get a PCI card and wait for g80 or r600.