Nvidia 7950GT Volt mods

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11-06-2006, 01:19 PM
psyclist

Nvidia 7950GT Volt mods

Hey All,

I figure i would start a thread to help along the 7950 owners out there, for the reading that i have been doing the volt mods on this card are the same as the 7900GT, just with differing voltages.

Most of the mods spoke of are hard mods using conductive paint/solder. But doing a little more reading, i have found that there are two options in the bios for voltages 1.25v and some @ 1.35v, I checked my bios (BFG) with NiBiTor and found that my bios is set to 1.25v in both 2D & 3D mode (this would explain the poor overclock of only 590 on the core) So i am going to reflash the bios with it adjusted to 1.35v in 3D mode and see what core speed i can get.

Digging a little deeper again I found the eVGA 7950GT SC bios to have a third option of 1.45v!!! I am wondering if anyone has this card? and what kind of clocks they are seeing? 700Mhz would be real nice on this core!

Will keep updated, any info on the 7950 would be great!

:toast:
11-06-2006, 02:57 PM
t024484

Quote:

Originally Posted by psyclist

Hey All,

I figure i would start a thread to help along the 7950 owners out there, for the reading that i have been doing the volt mods on this card are the same as the 7900GT, just with differing voltages.

Most of the mods spoke of are hard mods using conductive paint/solder. But doing a little more reading, i have found that there are two options in the bios for voltages 1.25v and some @ 1.35v, I checked my bios (BFG) with NiBiTor and found that my bios is set to 1.25v in both 2D & 3D mode (this would explain the poor overclock of only 590 on the core) So i am going to reflash the bios with it adjusted to 1.35v in 3D mode and see what core speed i can get.

Digging a little deeper again I found the eVGA 7950GT SC bios to have a third option of 1.45v!!! I am wondering if anyone has this card? and what kind of clocks they are seeing? 700Mhz would be real nice on this core!

Will keep updated, any info on the 7950 would be great!

:toast:

Are you sure the necessary hardware is installed to support Bios switching ?
11-07-2006, 10:21 AM
psyclist

Hey,

Yeah i updated my bios last night using NiBiTor I readjusted the voltage for 3D to 1.35v (original 1.25v) as a result my core clock went from 590 to 637! so it must have the ability.

Im glad you looked in on this thread, i have read your various other posts and seem to be quite knowledgeble with respect to Nvidia cards. I am coming from an X850Pro that I unlocked then volt modded, so I have a bit of background in this sort of thing. I am just wondering about the 1.45v option from the eVGA card? do you think it may have extra on board hardware to handle the voltage? or just a simple bios option?

thanx again,
:toast:
11-07-2006, 03:15 PM
t024484

Quote:

Originally Posted by psyclist

Hey,

Yeah i updated my bios last night using NiBiTor I readjusted the voltage for 3D to 1.35v (original 1.25v) as a result my core clock went from 590 to 637! so it must have the ability.

Im glad you looked in on this thread, i have read your various other posts and seem to be quite knowledgeble with respect to Nvidia cards. I am coming from an X850Pro that I unlocked then volt modded, so I have a bit of background in this sort of thing. I am just wondering about the 1.45v option from the eVGA card? do you think it may have extra on board hardware to handle the voltage? or just a simple bios option?

thanx again,
:toast:

To answer your question, I need a picture of your board.
11-07-2006, 03:53 PM
wittekakker

I had the EVGA superclocked 7950GT for a few days. To bad I saw this thread only now. I had it overclocked to 650/850 running games/3d mark.

Sparkle's 7950GT stopped a lot earlier: 615MHz on the core.
I'm testing Asus now. Its doesn't come with memory heatsinks, so I guess this will be the slowest of the 3 (when it comes down to overclocking stock cards). Memory chips run very hot.
11-07-2006, 04:55 PM
VETDRMS

I have been working on an eVGA 7950GT KOSC for the last few days. The 1.45v selection in the bios results in the same 1.35v. They actually used the same mods listed in the 7900GT thread for increasing the voltage. They used a soldered on connector in the B and C location for a .15v increase in voltage.

I have had problems with this board, and another 7900GTX refusing to switch from 2D to 3D mode so I have the same voltage in both mods and a fixed clock rate.

This 7950GT does not like over 1.6v, at 1.6v it is at 750mhz on core and 1780mhz on memory. I installed a 50kohm resistor in place of the 'J' resistor and removed the bridge eVGA installed on the 'C' bridge for the 1.45vid resulting in 1.6v. The Infineon 1.4ns memory is at 2.19v.

:cheers:
11-07-2006, 05:07 PM
wittekakker

People buying a 7950GT might look for Gigabyte's card. They seem to have a 7950GT with 1,2ns RAM.
11-08-2006, 08:36 AM
psyclist

What is a safe voltage for the G71 core? I have a Thermalright V1 Ultra With two Fans attached, this should keep the temps in check (close to watercooling temps)

As for the RAM, what is the stock voltage for the 1.4ns chips? and what are they happy at with say ramsinks and a fan on em?
11-08-2006, 10:06 AM
aasmaukr

I got a Club3D 7950GT running at 735/910 (1,53/2,2V) air cooled. I'm going to put the card under phase change when I get my new ram.
Wondering how high voltage the core can take? And the mem?
11-08-2006, 10:35 AM
VETDRMS

Quote:

Originally Posted by aasmaukr

I got a Club3D 7950GT running at 735/910 (1,53/2,2V) air cooled. I'm going to put the card under phase change when I get my new ram.
Wondering how high voltage the core can take? And the mem?

Is your memory completely stable? I noticed at over 900mhz it would run fine in ATITool, but after some time in NFS:Carbon or BF2 or 3DMark05 I would get memory corruption.

Also, from my 7950GT I am having a lot of problems with OCP that do not seem to be resolvable. At anything over 1.6v it is not stable. I have tried all the various mods with no improvement. My 7900GTX could handle 1.8v just fine.

I'm interested in how the phase change works, post an update.
11-08-2006, 11:04 AM
aasmaukr

I sure will :D The mem was stable, 3DMark05 ran fine. I had two 120mm fans blowing at the card. I really hope my gpu takes more than 1,6V..
11-08-2006, 03:41 PM
wittekakker

ASUS 7950GT with no memory heatsink overclocks to 820MHz (1640DDR), mad stuff!
11-15-2006, 10:05 AM
Demo

would the Ink mod for teh 7900GT work on the 7950GT's also ?
11-15-2006, 10:08 AM
DEVIL K-ce

Quote:

Originally Posted by Demo

would the Ink mod for teh 7900GT work on the 7950GT's also ?

Vmod for 7900GS, 7900GT work ok on 7950GT ( vgpu & pencil vmem )

btw - reference pcb :)
11-16-2006, 02:56 AM
Demo

Quote:

Originally Posted by DEVIL K-ce

Vmod for 7900GS, 7900GT work ok on 7950GT ( vgpu & pencil vmem )

btw - reference pcb :)

Ok, i think both Palit and Inno3D use reference PCB
11-16-2006, 05:40 AM
wittekakker

Asus and EVGA have both the same design, Sparkle looks differant
11-16-2006, 06:00 AM
Equil|briuM

http://i11.photobucket.com/albums/a1...8203800X22.jpg

Thats the Highest I can get via '06 wise via my current rig - Cant wait till the end of this month!

This is with the XFX Geforce 7950GT which is PASSIVELY cooled.

610 Core.

824 Memory is my MAX.
11-24-2006, 03:57 PM
jonni3

1 Attachment(s)

I have the leadtek 7950GT & the best i can manage is 621 core & 1584 mem with no mods & on air which is good for just over 6k in 3dmark06, so with doing this v.mod & E.K waterblock i should be able to squeeze a bit more from it ... i hope
11-30-2006, 12:29 PM
psyclist

I had some issues with my power supply, crap ass antec smart power...(never buy antec, horrible customer service...) picked up a OCZ GameXStream 700W...no more troubles! and I have my V1 Ultra mounted and am just wondering what voltage i can push into the core...the V1 brings temps close to watercooling...i was thinking 1.5v, meaning red and purple in the 7900GT volt mod right?...just making sure...
12-03-2006, 04:29 PM
psyclist

Mod done, and now sitting pretty at 700Core and 825mem, good for 11,473 in 3D05, i have left the delta at the stock 20mhz, would it benefit from raising it to 40 or 50? or drop it and bring the whole core up? thanx for any info!
12-15-2006, 09:46 AM
wittekakker

Vmod for Sparkle is online @ VR-Zone forum.
12-22-2006, 04:39 AM
alexisd1969

1 Attachment(s)

Here is mine.I did the 1.55 volt and 2.2 core mod.With the circuit pen.
12-23-2006, 11:27 PM
iadstudio

Quote:

Originally Posted by alexisd1969

Here is mine.I did the 1.55 volt and 2.2 core mod.With the circuit pen.

Could you point me in that direction? Where are those mods posted?
12-24-2006, 08:00 AM
psyclist

maybe some definitive pics? i kinda waded through the 7900GT voltmods and found what i thought to work, and it seems to have done the trick, but no multimeter to verify voltages...I would post pics but my digicam was stolen out of my car awhile back...bastards, things for xmas...digicam and multimeter;)

Have a good holiday guys...whatever flavor it may be
:toast:
12-24-2006, 08:24 AM
Pyr0

http://www.xtremesystems.org/forums/...2&d=1162820917

red=+0.05, yellow=+0.1 and purple is +0.2.
12-24-2006, 10:55 PM
ziddey

Hmm is this any different from the other guide more famously known as the anand one? http://forums.anandtech.com/messagev...readid=1847758
I'm currently sitting at 1.5v and clocking in at 680. Can't think of any reason I'd get different results with this than that, but just curious. This one definitely looks like the better way to go about it than the other though. Other one looks more rigged. Comments?
12-29-2006, 03:03 PM
camouflage

:D 7950GT is an interesting card for the mid range budget - so I decidet to buy one, this one:

http://www.mvktech.net/content/view/3482/39/

Will arrive first week of January. :toast:
12-29-2006, 03:22 PM
Pyr0

the Foxconn 7950GT i have here doesn't seem to switch voltages
i've done the 1.5V mod but it stays at 1.5V in 2D mode :shrug:
01-22-2007, 06:34 PM
gaara

Hi, sorry to bring this back up, but this seemed to be the most relevant topic I found while searching. Today I recieved my evga 7950GT KO and I have already overclocked it to 610/1520 which appears to be the max for now, although that may change after it burns in a bit.

Anyways, I am aware of the hardmod for these cards to increase voltage, however since I am going to use evga's stepup program within 3 months to upgrade to a geforce 8, I don't have any intention of soldering anything or whatnot. However, the thread starter seems to imply that voltage can be adjusted simply by flashing to an edited BIOS. Can anyone confirm this?

Thanks
01-22-2007, 06:43 PM
VETDRMS

gaara My 7950GT KO SC is at 700-1800 right now at 1.50v. This is with a Zalman copper cooler and some swiftech ramsinks. It is a good card and did 750 on water, but the voltage regulator craps out above 1.58v so there was probably more in it but couldn't get the juice.

I modded an 8800GTX last night and that is kind of a b*tch as the resistors on the GPU regulator are tiny and will fry really quick.

They are talking about changing the VID setting in the bios, but my KO SC's default VID was 1.45 (Performance 3D Mode) but actual voltage was 1.35 metered. So, first check your bios with NiBiTor and see what VID it has set under performance mode, if for some reason a lower VID is set it is possible that changing it to a higher VID will switch to that higher voltage level. The mod is about the easiest you can do and does not require soldering. I lock the VID out at the base 1.2v and use the mods for constant voltage as I have had issues with Nvidia's performance mode selection not functioning correctly (getting stuck in 2D mode).

:cheers:
01-22-2007, 06:59 PM
gaara

Thanks for the fast reply. You have to forgive me for being a bit of a noob on the subject since I haven't used nibitor in quite a while and that was only limited to manually changing the "default" clock frequencies.

Anyways, I have it opened up, and under the voltage tab as you are probably aware there are two tabs, exact mode and VID mode (I presume I should be looking at VID mode since you mention it above). The following is currently set:

Under Exact Mode:
3D - set to 1.25v (option to set to 1.35v)
Thrtl - N/A
2D - set to 1.25v (option to set to 1.35v)

Under VID Mode:
Voltage 2 - Set to 1.35v (option to set to 1.25v, and two ?.?v which I presume are 1.45 and 1.55v)
Voltage 1 - Set to 1.25v (options are the same as above)

Currently I have stuck with the stock cooler that came with the card, however I have a Maze4 block and some monster ramsinks that I can use. If it comes to a point where I can get up to 700/1800 or around there like you, I might just scrap the stepup and put the watercooling on this sucker and keep it, the only reason I haven't yet is because it is a pain in the ass reattaching the stock heatsink (From my experience).

Again, thanks for the help
01-22-2007, 08:14 PM
ziddey

pull out your dmm and do some testing to see what you're at now. it's possible to use nibitor to change voltages but i'm not sure what range you can choose from. but as said, if you set to 1.2, you can do the mods as it applies to you.
http://forums.anandtech.com/messagev...readid=1847758 for a guide. it only requires conductive ink, which can be wiped off completely with some alcohol
02-18-2007, 02:24 AM
nitroin

Quote:

Originally Posted by wittekakker

Vmod for Sparkle is online @ VR-Zone forum.

[Hi guys!] :)

Could you post me a link?? I've this card but i didn't find anything vmod for her :(

And, the result of flashing the bios is the same of doing the pencil mod?? thnx
02-18-2007, 05:07 AM
wittekakker

nitroin, here you go:
http://forums.vr-zone.com/showthread...hlight=Sparkle
make shure to read to whole thread though!
02-18-2007, 05:09 AM
nitroin

Quote:

Originally Posted by wittekakker

nitroin, here you go:
http://forums.vr-zone.com/showthread...hlight=Sparkle
make shure to read to whole thread though!

thnz so much...i've found it only 5 second ago :D

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