- Joined
- Nov 29, 2005
- Location
- Brisbane Australia
Thanks to some excellent info on Guru3d forums and VRzone these cards can in most cases I guess be overclocked quite
a lot higher when V modded
Vgpu mods http://forums.guru3d.com/showthread.php?t=200420
Vmem mods http://vr-zone.com/index.php?i=3317
First I Vmem modded my MSI 7800gs G70 which so far has gotten my card stable at 1621mhz, probably some more to come.
Then I performed the Vid2 to ground mod from guru3d forums which when running in 3d mode has upped the voltage on
the Gpu from 1.4v to 1.5v.
Anyone who has overclocked these cards will probably be familiar with the "Black screen lockup" problem, The answer
in my case was to apply Jimmor's "Red wire link" mod as the Vid2 ground mod does not stop this happening.
Now my card is currently running stable at 516mhz Gpu and 1621mhz Vmem.
Any lucky dude who has a G71 based 7800gs should be able to get up to 700mhz Gpu speed as the G71 defaults to 1.1v
in 3d mode, so shorting Vid4 in that case gives 1.5v Vgpu.
Hopefully this helps some people out here as I couldn't find much on these forums about Volt modding 7800gs cards.
Of course keep in mind that doing any soldering on the pcb Like I did will immediately void the warranty.
I also eventually had to disable the Overclock Test in Rivatuner as it wouldn't let me go higher than 512 Gpu,
but would pass ram at 1700mhz, haven't benched at 1700 yet though.
Anyone interested in doing this should thoroughly read the forums I have linked to first as different
Brands of cards and varying hardware configurations may mean slightly different steps are required. What worked
with my card may not with someone elses, especially if a card deviates from Nvidia reference design.
a lot higher when V modded
Vgpu mods http://forums.guru3d.com/showthread.php?t=200420
Vmem mods http://vr-zone.com/index.php?i=3317
First I Vmem modded my MSI 7800gs G70 which so far has gotten my card stable at 1621mhz, probably some more to come.
Then I performed the Vid2 to ground mod from guru3d forums which when running in 3d mode has upped the voltage on
the Gpu from 1.4v to 1.5v.
Anyone who has overclocked these cards will probably be familiar with the "Black screen lockup" problem, The answer
in my case was to apply Jimmor's "Red wire link" mod as the Vid2 ground mod does not stop this happening.
Now my card is currently running stable at 516mhz Gpu and 1621mhz Vmem.
Any lucky dude who has a G71 based 7800gs should be able to get up to 700mhz Gpu speed as the G71 defaults to 1.1v
in 3d mode, so shorting Vid4 in that case gives 1.5v Vgpu.
Hopefully this helps some people out here as I couldn't find much on these forums about Volt modding 7800gs cards.
Of course keep in mind that doing any soldering on the pcb Like I did will immediately void the warranty.
I also eventually had to disable the Overclock Test in Rivatuner as it wouldn't let me go higher than 512 Gpu,
but would pass ram at 1700mhz, haven't benched at 1700 yet though.
Anyone interested in doing this should thoroughly read the forums I have linked to first as different
Brands of cards and varying hardware configurations may mean slightly different steps are required. What worked
with my card may not with someone elses, especially if a card deviates from Nvidia reference design.