NVIDIA 7900GTX, 7900GT & 7600GT Voltage Mods
Posted on Wed March 8 2006 7:00 pm by VRArchiver
On top of our in-depth reviews of the newly launched 7900
and 7600 series of GPUs, we have also looked into the voltage regulation
on each of these cards and we bring to the overclocking community the first
Voltage modifications guide in the world for these cards! For the 7600GT all you need is a humble pencil to do it!
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Comment by: busy on 09-Jun-2007 3:12 am
| thx |
Comment by: Nosfer@tu on 09-May-2007 2:59 pm
Quote:
Dont understand why, but the holes areoriganaly ment for mesuring if the card works good! Try turning it around and look at the other side, if you dont get an answer here in 24 hours I think you should try on XS.org |
Comment by: awdrifter on 09-May-2007 5:07 am
| No, I COULDN"T measure the voltage, that's why I'm just going by the temp. From what I can find I'm on the upper limit of it, so I think I'll redo the pencil mod and leave the resistence higher. (maybe 555-560 ohms, it's at 545 ohms right not). Here's a pics of my PCB, as you can see, I can't measure the voltage. My card is a Biostar 7600GT 256mb GDDR3. http://img75.imageshack.us/img75/600/1000314az6.jpg |
Comment by: Nosfer@tu on 09-May-2007 5:03 am
Quote:
 What brand do you have ? I would say pictures are needed 2 or at least a linkt to what model you have |
Comment by: awdrifter on 09-May-2007 4:39 am
| Already installed a VF700 AlCu and have a voltmeter. But my problem is my card doesn't have that voltage measuring dot that's shown on the reference card. So I have no way of physically measuring it. Even tho CPU-Z is not 100% correct, it's correct enough for me. |
Comment by: Nosfer@tu on 09-May-2007 3:55 am
Quote:
Droop a 120 mm fan on it, and spend 10 $ on a multimeter or Voltmeter And CPU-Z dosent read Vcore very good  |
Comment by: awdrifter on 09-May-2007 3:18 am
| Kinda a releated question, I did the vGPU mod on my 7600GT, but my card doesn't have the vGPU measure point shown in the guide. Is there any program that can detect the vGPU voltage? (Like CPU-Z) I just want to make sure I'm still in the safe range. The temp looks ok, it idles at 47c and max load at 70c. Thanks. |
Comment by: Nosfer@tu on 30-Mar-2007 2:47 pm
Quote:
What Card are we talking about? Why shouldent you be able to go beound the chips specifications ? |
Comment by: wheed whack3r on 30-Mar-2007 12:28 pm
| On the RT9232 IC chip I have a limit of 1.50 Volts and the specs for the chip confuse me a little so could someone please explain how to disable the voltage limit or at least increase it to 1.75 volts. |
Comment by: Flymann on 23-Oct-2006 6:43 am
Damn...  Ok thanks for the reply  The vmem pencil mod is impossible too ? |
Comment by: Shamino on 22-Oct-2006 11:40 pm
| sorry mate cant be done, the resistance is too small a pencil is not tough enuff |
Comment by: Flymann on 22-Oct-2006 11:37 pm
Quote:
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Comment by: Don__1 on 21-Oct-2006 9:16 am
Quote:
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Comment by: Shark-357 on 21-Oct-2006 1:15 am
| For VGPU mod do i need a 200ohm VR or 200K ohm VR? Coz i just realized that i got a 200Kohm VR soldered on but didnt try it out yet and i git DICE waiting in the other room...so a quick reply would be apreciated.. thx |
Comment by: Flymann on 19-Oct-2006 11:44 am
| Hi all First, thanks a lot for this great thread. I have bought a MSI 7900 GTO (same PCB as 7900GTX and flash with MSI 7900GTX BIOS) My graphic card is recognized as a 7900GTX, and i've modded vgpu with NiBiTor, but after flash, gpu voltage still the same (1.331v 2D/1.444v 3D) So I want to try a pencil mod. My first pencil mod was on a X800Pro and it as reached 630Mhz with, 550 without. So I'm still enthusiasted by pencil mod. I've search on forum etc. no 7900GTX pencil mod topics/threads/article available. Do you know how to do on a 7900 GTX PCB ? The vmem on the 7900 GTO is 1.82v *P.S : Please stay a bit lenient with my poor english  |
Comment by: choco on 01-Sep-2006 12:05 am
| No one knows? |
Comment by: choco on 31-Aug-2006 5:11 am
| Please, help! i have 1.7 vmod on chip and 2.22 on memory XFX 7900gt 520M in 3DMark06 HDR and PS 2.0 are ok! But in CPU test after some time i have Blackscreen(not Blankscreen)->reboot only..... what is the problem??? 770/1980 on 710/1500 i have the same! HELP!!! i have removed two overcurrentprotection resistors, problem isn't dissapear! PSU is HIPER 580W |
Comment by: stakh on 07-Aug-2006 12:46 pm
| What resistor should be corrected a pencil on 7900gtx ? |
Comment by: Shamino on 07-Aug-2006 10:29 am
Quote:
pencil can do it too i think |
Comment by: stakh on 07-Aug-2006 5:09 am
| Supertim0r I wish good luck |
Comment by: Supertim0r on 07-Aug-2006 4:42 am
| default vmem on the cards I vmodded are 2.20-2.21v |
Comment by: stakh on 07-Aug-2006 2:48 am
| http://www.samsung.com/Products/Semi...24qc_rev15.pdf Voltage of memory of 2.0 volt face value. Has measured on PCB = 2.12 volt. Cooling Zalman does not help. On 7900GT at a voltage reduction for memories blinkings of the screen stop. On 7900GTX it is installed ISL6534 and I do not know as to lower a voltage. |
Comment by: Shamino on 07-Aug-2006 1:50 am
| u can't push the mems too far without good cooling on core so u can just stay to stock volts and push the mem till its unstable |
Comment by: stakh on 07-Aug-2006 12:57 am
| How on a PCB 7900GTX to lower a voltage of memory up to 1.9-2.0 volt? At me blinks the screen at an exit from games. You know the decision of a problem? |
Comment by: Supertim0r on 07-Aug-2006 12:27 am
| vmodded cards / result |
Comment by: SpoASU on 03-Aug-2006 2:50 pm
| Edit. Nothing to see here |
Comment by: Supertim0r on 02-Aug-2006 11:45 pm
| i'm not modding them at home, this why I asked someone to spot me a ground. (no computers @ lab) |
Comment by: phatic on 02-Aug-2006 3:18 pm
Quote:
Pick a nice looking spot, that would be easy to solder on to. Then measure the voltage at this spot with respect to ground (with the computer turned on). If it equals 0, that one is your winner! |
Comment by: Supertim0r on 02-Aug-2006 12:20 pm
| Hi, Could someone point me the best ground to use for vgpu 7900GTX ? |
Comment by: DaLaLLeR on 14-Jul-2006 6:30 pm
| Could anyone explain the following to me?! why are the pics of the [NVIDIA 7900GTX, 7900GT & 7600GT Voltage Mods] ( http://sg.vr-zone.com/?i=3330 ) online and the pics of the [NVIDIA 7800 GS AGP Voltage Mods] ( http://www.vr-zone.com/?i=3317 ) offline ???!!!! i obviously i need a 7800 GS voltmod guide and without the pics it's useless... |