Single PCB GTX 295 Vcore mod

Hi all!

Got two of these single PCB cards last weekend. Figured out the Vmod and I like to share it to you.

It is simple mod, but it does not feel like it, cause we all have used to play with software nowadays.

Here is the mods:
http://www.aijaa.com/img/b/00999/4649038.png

http://www.aijaa.com/img/b/00941/4648955.png

The size of removed resistors:
http://www.aijaa.com/img/b/00213/4649026.jpg

The effect:
http://www.aijaa.com/img/b/00092/4649028.jpg

So, If you like to adjust voltage, you have to change 0 to 1 or other way around. Easiest way is to remove all resistors and solder in a dip switch. After that mod you can select all possible voltages with the switch.

Yuo can also do like in the mod picture. Use a fixed voltage you prefer.

Remember, that real voltage will be 0.03V lower than the vid you select. When you boot, you will see some higher voltages on multimeter, but do not be afraid in that point. They will go down as soon as the system will boot.

Some usable VID combinations (first one is default):

0,0,0,1,1,0,1,0 = 1.0625V
0,1,0,0,1,0,1,0= 1.1V
0,0,0,0,1,0,1,0= 1.125V (in the pics)
0,1,0,1,0,0,1,0= 1.15V
0,1,0,0,0,0,1,0= 1.2V
0,1,0,1,1,1,0,0= 1.25V

and so on...

:up:

sf3d did you made this mode already ? can you show pics done mode ? it's little hard to understand this modification for me :D

Petri, if you want "normal" vmod with VR just solder one between pin #4 and GND. You should know that though since you figured out OCP already ;)

Yes. Just remove the resistor with green frames, which is shown in pictures and you will get 1.095V in load. That should be enough to basic users with aircooled systems.

If you like to have more voltage, you have to modify whole VID combinations like explained in the end of first post.

Those orange lines are there, just to make it more unclear :) No, those lines are there to make it more reliable and you can see where you have to move resistors or where to take them out.

This mod is exactly same as it was in 7900GT.

Quote:

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Originally Posted by elmor

Petri, if you want "normal" vmod with VR just solder one between pin #4 and GND. You should know that though since you figured out OCP already ;)

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Nice!

If you have already done and tested that mod, post a screen in here.

I think this fixed voltage is easy in 24/7 use. For extreme OC you need to have better tools.

Clap clap. Your my hero! I will have to see what mine clocks to under water and if it isn't satisfactory I will look into this mod.

Very interesting.... very :shocked:

wow.. awesome job!!! THis is sweet.. now we need a way to mount the GPU Pot :) Well.. I guess I can use clamps :P

- Ton

Quote:

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Originally Posted by SF3D

Nice!

If you have already done and tested that mod, post a screen in here.

I think this fixed voltage is easy in 24/7 use. For extreme OC you need to have better tools.

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It have not tested it, but should work with 99% certainty ;)

I've already tried with pin4 to ground with a VR.

Quote:

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Originally Posted by Moonman

I've already tried it with FB pin to ground but it was acting strange.
Voltage increased for about a second when I turned the power on and after that it jumped back to stock voltage.

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So I think it has to be done with VID mods, tnx SF3D :)

Yeah..the easiest way is not always the one, which will work. FB pin will not work. It might chage some offset, but not actual vcore.

VID method is easy to use with dip switch. I will do it and use the card under LN2 soon. These seems to be a bit better than the hamburger models.

LN2 pots will fit perfectly on these. SLI is usable with extra long SLI cable, so nothing is impossible :)

Hmm, ok. I will check that out, hard when I don't have the card though :)

edit: Does it work as long as you don't reboot? Does the voltage go up again after you enter OS or 3D? There might be a fix but I'd need to do some experiments.

With VR voltage will rise just for 1 to 2 seconds and then jump back to stock, in 3D also stock voltage.

Some overclocked results from last week. Room is still so hot.. can't push more on air:

http://www.aijaa.com/img/b/00445/4681172.jpg

Just card testing.. rest of the setup is on very low freq's.

So, remove that "green" resistor and you will hit these speeds very easily :up:

More to come later..

So petri , for 1,21V mod , IS it right ?

http://www.pt1t.eu/public/F1OC/295GT...V-VGPU-mod.jpg

This one works and gave 1.28V in load

Quote:

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Originally Posted by SF3D

This mod is exactly same as it was in 7900GT.

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With my 7900GT's I used the same trace pin that we use to mod athlon xp's into MP's. So trace pin will work in this cas too? Not sure since pictures are no longer showing.

Quote:

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Originally Posted by The Nemesis

With my 7900GT's I used the same trace pin that we use to mod athlon xp's into MP's. So trace pin will work in this cas too? Not sure since pictures are no longer showing.

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Hehe. I ment the method of modding is the same in this VGA.

Pictures should be just fine. Wait a bit, if they are not loading for some reason.

hey guys any idea if the chip is vr11 or vr10 at stock

i did 0100010 = 1.2v and got 1.1v

http://i556.photobucket.com/albums/s...os1/vid295.jpg

thought i,d ask as i dont want to give it 1.6v just yet :)

sf3d amazing job man.also killer job on the 4890 mods,i watched that thread closely.

voltera reg or not,i knew someone would get this single pcb to climb hi...








i do have 4 questions.


1.can i increase my core without touching my shaders at all, to test core limit? <---most important to me!!!

2.doing this volt mod increases core,shader and memclocks at the same time or what?

3.after the mod u can use evga percesion but like on nitrous oxide,higher limits across the board ehh?

4.after the mod is it possible to use evga voltage tuner after u unlocked the volt limit higher?





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this is what i run 24/7 on air now...gtx 295 co-op

701/1215/1511 i think my core can go wayyyy higher 730+ but my shaders wig out first(more volts might help them?).my temps are amazing on air...

http://i76.photobucket.com/albums/j11/bf2nut/295now.jpg
http://i76.photobucket.com/albums/j11/bf2nut/295now.jpg



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rules of thumb for overclocking my gt 200 series---

i go by this,whoever wrote it? ty very much...techpowerup forums

"GPU overclocking and stability testing

It seems (based on opinions) that only proper way of OC'ing GPU (all clocks) is to start with:
a) pushing shaders up first
b) then push GPU core clocks (maximum up to 1/2 of shaders value)
c) as a last step push memory (VRAM) until it hardlocks your system on stress testing or in games, meaning you need to drop down to last stable value"

ref GT200 chart for clocks..
http://img14.imageshack.us/img14/349/gpuocchart.jpg





most common explanations of errors:by "after" from techpowerup forums

"If your system hard-locks, and requires a reboot then your memory is too high.

If your system is showing weird artifacts like flashing colors and intermittent blank screens and/or the driver crashes, then your shaders are too high.

If only the nvidia driver crashes without any visual anomalies, then your core is too high."



@ evocarlos-
i love lamp too,haha!

can somebody post a picture with the points for voltage measurement on each GPU??

any of the red points marked top for one core and bottom for the other
http://i556.photobucket.com/albums/s...1/295vread.jpg

Quote:

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Originally Posted by railmeat

i do have 4 questions.


1.can i increase my core without touching my shaders at all, to test core limit? <---most important to me!!!

2.doing this volt mod increases core,shader and memclocks at the same time or what?

3.after the mod u can use evga percesion but like on nitrous oxide,higher limits across the board ehh?

4.after the mod is it possible to use evga voltage tuner after u unlocked the volt limit higher?

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1. You can do it if you set your core clock linked with shaders, then uncheck the 'Link clocks' and set your shaders lower.

2. With this vmod you can increase core and shader clocks, mem clocks will decrease when setting your maximum core/shaders.

3. and 4. don't know

Finally did the mods and tested.
0,0,0,1,1,0,1,0 = ~1.084 V 720 MHz core, shaders linked
0,0,0,0,1,0,1,0 = ~1.102 V 740 MHz core, shaders linked
0,0,0,0,0,0,1,0 = ~1.308 V 792 MHz core, shaders unlinked@1756 MHz

Mems running @1248 MHz. If dropping memory to 1188 MHz I can push core one step higher but only if the core tems are pretty low.
Giant step compared to stock vgpu, tnx for your work SF3D :up:

Quote:

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Originally Posted by Moonman

1. You can do it if you set your core clock linked with shaders, then uncheck the 'Link clocks' and set your shaders lower.

2. With this vmod you can increase core and shader clocks, mem clocks will decrease when setting your maximum core/shaders.

3. and 4. don't know

Finally did the mods and tested.
0,0,0,1,1,0,1,0 = ~1.084 V 720 MHz core, shaders linked
0,0,0,0,1,0,1,0 = ~1.102 V 740 MHz core, shaders linked
0,0,0,0,0,0,1,0 = ~1.308 V 792 MHz core, shaders unlinked@1756 MHz

Mems running @1248 MHz. If dropping memory to 1188 MHz I can push core one step higher but only if the core tems are pretty low.
Giant step compared to stock vgpu, tnx for your work SF3D :up:

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hmmm ty for your answers.

did u see my bone stock 295 run stalker bench thread?
http://www.xtremesystems.org/forums/...d.php?t=233771

How on earth do you people manage to figure out these mods???

I would be far to afraid of tampering with my graphics cards in fear of permanently damaging them!