Convert your 7900GT into a 256Mb 7900GTX

[Roger_D25]

Demo,
Did your Inno3D card come with a stock voltage of 1.2v in both 2d/3d modes? Also do you remember what clockspeed your core was able to run at while still being stable before the voltage mod? Last but not least is 650Mhz the highest your card runs while still being stable @ the current voltage of 1.55v?

My card's GPU is still running at stock voltage (1.45v) but I have slightly modified the memory voltage which allows me to run at 860-870Mhz while still being stable. That is a good 80-100Mhz higher than it would run at stock voltages. I'm about to mod the GPU to run at 1.55v, I'm curious as to what I'll be able to run the core at after that mod while still being stable. Although I can currenlty run my core at 670Mhz it's more stable at 650Mhz and that is where I leave it for gaming and everyday use. I'll post back later today after the mod and let you guys know if it allowed my core any additional headroom.

[Roger_D25]

t024484,
Well I just finished connecting the "Yellow" pads together for an extra 0.1v and it seems to have worked fine. The only thing is that my card is now always running at 1.55v in both 2d and 3d, was this to be expected? To be accurate I should say that my card runs at 1.548v from bootup until I start a 3d application, once the application starts the voltage jumps to 1.551v, then it again lowers to 1.548v once I close the application? Do you have any thoughts on this (I'm a bit worrried because I have a feeling this isn't supposed to happen.

One last thing, since my card is a Signiture Series the "Red" and "Purple" connections are already connected because my stock 3d voltage is 1.45v, well those connections are not simply connected with a bit of solder but they are actually connected with what looks like resistors or small capacitors (not knowledgeable enough to know which it is, or if it is either of those two things). Either way it is not just a simple connection. Do you happen to know anything about that or is it normal? As always thanks for your help and time!

[t024484]

t024484,
Well I just finished connecting the "Yellow" pads together for an extra 0.1v and it seems to have worked fine. The only thing is that my card is now always running at 1.55v in both 2d and 3d, was this to be expected? To be accurate I should say that my card runs at 1.548v from bootup until I start a 3d application, once the application starts the voltage jumps to 1.551v, then it again lowers to 1.548v once I close the application? Do you have any thoughts on this (I'm a bit worrried because I have a feeling this isn't supposed to happen.

One last thing, since my card is a Signiture Series the "Red" and "Purple" connections are already connected because my stock 3d voltage is 1.45v, well those connections are not simply connected with a bit of solder but they are actually connected with what looks like resistors or small capacitors (not knowledgeable enough to know which it is, or if it is either of those two things). Either way it is not just a simple connection. Do you happen to know anything about that or is it normal? As always thanks for your help and time!

The components used for RED and Purple are zero ohm resistors, also the same as a dot of solder. That yellow is giving you 1.55Volt all the time, can only mean that either you have damaged something, or you have made more connections than just the two points in yellow.

The black component with three pins below the red and yellow connection with the text Q517 next to it, should show on the side with only one pin, 3.3 Volt in 2d and 0 Volt in 3D.
But before you try measuring this, it may be better to remove your yellow connection, and see if everything is again like it was before.

[Roger_D25]

Interesting t024484, I didn't think that was how it was supposed to be. I've been running it this way since yesterday afternoon with no problems so far (I only ran it this long because I had no idea if this was suppose to happen or not, otherwise I would have pulled it out). Also when I connected the two points I used conductive ink like many do. Because I've learned from my mistakes though I didn't use the pen for the connection, I put a tiny dab on the end of toothpic and with the aid of a magnifying glass and additional light I very carefully dapped between the two points. What I'm getting at here is there is no way I connected anything except those two points. Also I used my meters continuity tester to make sure that was the case (although I don't know how effective that was since many of those points have some sort of continuity between them)? Finally I used some isopropyl alcohol afterwards to completly clean that area of the card (fingerprints etc..).

I should add one more thing, I set my meter up so that it was measureing the GPU voltage without having to hold the probes myself (I just put the meter by my keyboard while measureing so I could actively monitor voltage). Anyway I measured from before hitting the power button until WinXP booted. Well from initiallly hitting the power button until right before WinXP fully loaded the voltage was only 1.2v on the money. Then right when WinXP fully loaded it jumped to 1.55v? I'll wait to hear back before I do anything but I assume the best thing to do is remove the connection and make sure things go back to normal first and then take it from there. Thank you very much t024484 for your help and time with this, it is very much apprecaited!

[t024484]

Interesting t024484, I didn't think that was how it was supposed to be. I've been running it this way since yesterday afternoon with no problems so far (I only ran it this long because I had no idea if this was suppose to happen or not, otherwise I would have pulled it out). Also when I connected the two points I used conductive ink like many do. Because I've learned from my mistakes though I didn't use the pen for the connection, I put a tiny dab on the end of toothpic and with the aid of a magnifying glass and additional light I very carefully dapped between the two points. What I'm getting at here is there is no way I connected anything except those two points. Also I used my meters continuity tester to make sure that was the case (although I don't know how effective that was since many of those points have some sort of continuity between them)? Finally I used some isopropyl alcohol afterwards to completly clean that area of the card (fingerprints etc..).

I should add one more thing, I set my meter up so that it was measureing the GPU voltage without having to hold the probes myself (I just put the meter by my keyboard while measureing so I could actively monitor voltage). Anyway I measured from before hitting the power button until WinXP booted. Well from initiallly hitting the power button until right before WinXP fully loaded the voltage was only 1.2v on the money. Then right when WinXP fully loaded it jumped to 1.55v? I'll wait to hear back before I do anything but I assume the best thing to do is remove the connection and make sure things go back to normal first and then take it from there. Thank you very much t024484 for your help and time with this, it is very much apprecaited!

If the switch to 1.55Volt already happens when Windows is loading, it almost sounds as if your EVGA Bios is doing something wrong.
You can check with RivaTuner if VID 1 is active in 2D and if it stays active in 3D. If this is the case, your Bios should be modified.
What should happen is that Rivatuner shows VID 0 in 2D and VID 1 in 3d.
This VID signal is responsible for switching between 1.2Volt in 2D to 1.45 Volt in 3D(or to 1.55 Volt with the yellow connection) .

[Roger_D25]

I can't believe I forgot about this t024484 but about a week after I got the card I flashed the BIOS because eVGA sent it out to me with the 7900GT CO BIOS installed because that is the card I RMAed (clockspeeds 500/1500). I flashed it with the SS BIOS but I also changed a few things with NiBiTor before the flash. Besides clockspeeds I also changed the 2D voltage to be the same as 3D voltage. At the time I did it to test whether or not it would allow better clockspeeds with the intention of flashing it back to separate 2D/3D voltages but never did it! Hence why even after doing the 1.55v GPU mod it ran at 1.55v in both 2D and 3D! The only reason I realized this was because I threw the meter on it during system bootup (since it ran at 1.2v throughout bootup and only changed to 1.55v once WinXP loaded I knew it might be a BIOS issue and not hardware related, just as you suggested above). So sorry to have asked so many questions without fully testing everything first (BIOS and voltages), if I did I probably wouldn't have bothered anyone here!

[Demo]

Demo,
Did your Inno3D card come with a stock voltage of 1.2v in both 2d/3d modes? Also do you remember what clockspeed your core was able to run at while still being stable before the voltage mod? Last but not least is 650Mhz the highest your card runs while still being stable @ the current voltage of 1.55v?

My card's GPU is still running at stock voltage (1.45v) but I have slightly modified the memory voltage which allows me to run at 860-870Mhz while still being stable. That is a good 80-100Mhz higher than it would run at stock voltages. I'm about to mod the GPU to run at 1.55v, I'm curious as to what I'll be able to run the core at after that mod while still being stable. Although I can currenlty run my core at 670Mhz it's more stable at 650Mhz and that is where I leave it for gaming and everyday use. I'll post back later today after the mod and let you guys know if it allowed my core any additional headroom.

It came with a 1.2v in both 2d/3d modes. i only had a max of 520Mhz core OC with the stock volts, raised it to 1.50 and i was stuck at 640 ( LOL ) so i decided to raise it at 1.55 which gave me a max of 670 also but i run it at 650 24/7. i didnt bother to mod the memory yet as im not confident enough with the pencil mod,

[Shpoon]

Does anyone know where I can get the most recent driver for the card? (If I do this mod), and do I install the drivers first, then do hte voltmod, or other way around?

[Roger_D25]

Shpoon,
If your just talking about the regular Nvidia graphics card driver than it doesn't matter. Voltmodding the card doesn't affect the driver and vise-versa. That is to say that you can just uninstall the card, do your mods, and then reinstall the card with no problems at all. The only thing I would reccomend is to set the clock speeds to default speeds before you do the mod but I really don't think it matters.

PS, Somebody please correct me if I'm wrong!

[Shpoon]

Hmm, I thought it would need a special driver to run at independant 2d/3d voltages?

[Roger_D25]

Oh, you may have confused a special driver with the cards BIOS version. You would need to use a different BIOS version to take advantage of separte 2d/3d voltages on a card that didn't come that way stock. In fact Shpoon that is exaclty what this whole thread is about. t024484 explains what would have to be done to take a stock card which runs at only 1.2v and modify it to run at separate 2d/3d voltages!

[Shpoon]

Ya, I got that part, currently I'm using the old "1.45V always) mod. I was wondering if anyone had a link to the newest card bios (I said drivers).

[t024484]

Ya, I got that part, currently I'm using the old "1.45V always) mod. I was wondering if anyone had a link to the newest card bios (I said drivers).

http://www.mvktech.net/

[Shpoon]

Thanks very much

[aussie-revhead]

Hi guys , I did pass the explanation here for the frequency mod but cant find it now , could you please link me to the mem frequency mod for 7900GT ?

My Calibre has been running up to 750/840 with 1.55vmod and water cooling , will the frequency mod help me get more out of this card ? I get a random flicker of colour during post when the screen is blank , no problems during any other situation , I was told the freq mod will fix this , is this correct ?

Any help would be great .

BTW My best score so far in 3D06 is 7150

[Edit] I found it in the first post of the sticky , is this still current ? My questions still stand .

:-P

[t024484]

Hi guys , I did pass the explanation here for the frequency mod but cant find it now , could you please link me to the mem frequency mod for 7900GT ?

My Calibre has been running up to 750/840 with 1.55vmod and water cooling , will the frequency mod help me get more out of this card ? I get a random flicker of colour during post when the screen is blank , no problems during any other situation , I was told the freq mod will fix this , is this correct ?

Any help would be great .

BTW My best score so far in 3D06 is 7150

[Edit] I found it in the first post of the sticky , is this still current ? My questions still stand .

:-P

Yes it is still valid.

[aussie-revhead]

Thanks , in what ways will the freq mod help me ?

[ziddey]

where's a good place to order from in america? that place linked has a crazy minimum order price

[errol8000]

The components that I used, are 2 dual schottky diodes, type BAT54C, and 1 N type Mosfet BSS670S2L, that's all. I bought them from Farnell.com.
Any dual schottky diode with common cathode will do , and any low power N channel Mosfet with less then 10 Ohm channel resistance when switched on is O.K.

Thanks t024484 for your cool volt switching guide can you please tell me if
this mosfet is fine.. Thank you.

BSS123

MOSFET, N SOT-23 Transistor type:MOSFET Transistor polarity:N Voltage, Vds max:100V Case style:SOT-23 Current, Id cont:0.17A Current, Idm pulse:0.68A Power, Pd:0.36W Resistance, Rds on:6R SMD:1 Depth, external:2.5mm Length / Height, external:1.12mm Marking, SMD:SA Pins, No. of:3 Power dissipation:0.36W Temperature, current:25°C Temperature, full power rating:25°C Transistors, No. of:1 Voltage, Vgs th max:2V Width, external:3.05mm Width, tape:8mm