GTX285 various mods.. which may work for GTX260/280/295 also

[Brama]

you got to do step 2





ocp mod


i gained @ 10k ohm resistor/i gained @ 1k ohm resistor/use whatever fixed resistor you got between 10 ohm and 1000 ohm

sure you can try a 100 ohm resistor @ step 3

Thanks for clarification.
I did step 2; now my resistance is 7 kohm but my voltage with Napalm mods 1-2-3 done is 1.285 V.

I will try to reduce to 100 ohm the resistance of mod 3 and reduce to 22 ohm the ocp mod.

I let you know.

[Brama]

I have modified the 2 resistances: 100 ohm for mod #3 vgpu and 22 ohm for OCP.

The Vgpu raised to 1.31 V but unfortunately the OCP protection is triggering the solid color screen very often.

I checked many times the soldering and connection and everything seems good.

I wonder why the OCP is triggered with such a low resistor value (22 ohm).

Tomorrow I recheck everything and I will try 10 ohm.

[NapalmV5]

Hey Guys

i need a vgpu mod and maybe ocp mod for my Inno3D GTX285. PCB is rev2 like the EVGA Vanilla. http://www.xtremesystems.org/forums/...&postcount=461

Found OCP here: http://www.xtremesystems.org/forums/...&postcount=498

But still looking for vGPU Mod :/

Would be great if you could help me with it

rev2 vgpu mod already posted @ crotales thread

sorry i wont post anymore vmods

heres updated rev2 ocp mod

pic by chispy

[NapalmV5]

I have modified the 2 resistances: 100 ohm for mod #3 vgpu and 22 ohm for OCP.

The Vgpu raised to 1.31 V but unfortunately the OCP protection is triggering the solid color screen very often.

I checked many times the soldering and connection and everything seems good.

I wonder why the OCP is triggered with such a low resistor value (22 ohm).

Tomorrow I recheck everything and I will try 10 ohm.

idle or load voltages ^ ??

- step 2.. clean the area and surroundings around the resistor if you used pencil.. residue @ other components decreases vgpu

- redo step 2/lower resistor resistance down to 5k

- instead of solid screens after step 2/ocp mod you get freeze screens

step 2 worked on 2 diff 285s.. should work on other 285s aswell

idk what cooling youre doing but keep in mind temp sense also kicks in depending on the cooling/load/temp

if all else fails.. increase your cooling

good luck


and dont worry guys.. fermi is coming shortly and you wont have to bother with hard vmods anymore.. all soft

[der8auer]

Ah great, found it there Thanks!

[FtW]

Just wanted to thank NapalmV5 & the others who have contributed to the thread, lurked my way through & got my cards modded up, finally broke 30k with 2 gpus.

[andressergio]

Just wanted to thank NapalmV5 & the others who have contributed to the thread, lurked my way through & got my cards modded up, finally broke 30k with 2 gpus.

very nice mate I7 gives you extra points...

congrats on your score, i did 25+ only one and a Q9650 my post is back some page

cheers !
Sergio

[Brama]

idle or load voltages ^ ??

- step 2.. clean the area and surroundings around the resistor if you used pencil.. residue @ other components decreases vgpu

- redo step 2/lower resistor resistance down to 5k

- instead of solid screens after step 2/ocp mod you get freeze screens

step 2 worked on 2 diff 285s.. should work on other 285s aswell

idk what cooling youre doing but keep in mind temp sense also kicks in depending on the cooling/load/temp

if all else fails.. increase your cooling

good luck


and dont worry guys.. fermi is coming shortly and you wont have to bother with hard vmods anymore.. all soft

Thanks again for suggestions.
Naturally I mentioned full load voltages.

I will clean the area and redo the mod #2.

Unfortunately, even with OCP mod using 22 ohm, I have solid screens, mostly completely grey and PC full locked.

This evening I try again and I hope.

About Fermi, it seems will be very fast but produced initially in low numbers (high price) and warm like a little oven

I do hope that it will mount a Volterra or similar I2c programmable VRM controller.

[NapalmV5]

Just wanted to thank NapalmV5 & the others who have contributed to the thread, lurked my way through & got my cards modded up, finally broke 30k with 2 gpus.

http://i775.photobucket.com/albums/y...es/0630666.jpg

thanks/your welcome

nice sli clocks

[NapalmV5]

Thanks again for suggestions.
Naturally I mentioned full load voltages.

I will clean the area and redo the mod #2.

Unfortunately, even with OCP mod using 22 ohm, I have solid screens, mostly completely grey and PC full locked.

This evening I try again and I hope.

About Fermi, it seems will be very fast but produced initially in low numbers (high price) and warm like a little oven

I do hope that it will mount a Volterra or similar I2c programmable VRM controller.

volterra

chil chl831x

[Brama]

volterra

chil chl831x

Good! I read the data sheet and by sure is programmable. I hope that the nvidia reference design will use the 3 SMBus pins and not only the VID ones.

Yesterday night I spent about 4 hours to test mods on my VGA and I found:

- pencil mod #2 is not effective in my system. The resistance is 10.1 kohm and lowering it till 5 kohm I gain about 0.01 V.
- 150 ohm mod #3 is giving +0.04 V. With 100 ohm I have +0.07 V. With 70 ohm the voltage chip goes in protection mode (0.06 V).
- mod #3 seems not to consider Crotale OCP mod. I mean that if you use mod #3 to raise Vgpu, even with a 10 ohm resistor on OCP point indicated by Crotale, OCP is triggering in.



As yesterday I cooked my eyes, I am waiting for new Fermi design with a soft modifiable VRM controller.

[nkresho]

Just cleaned up my gtx285 mod and I want to share. Initially I had the points bridged with solder only, but it seemed half-assed IMO.

So, this morning, I cannibalized an old sprint cell phone (circa 2001) to get some zero ohm resistors of the correct size.

Here's what I got... (blue resistors are the ones I added)

Please pardon my amateur soldering skills as well. I only have experience making rc car batteries and working on far bigger stuff.







From looking at it, I am guessing the soldering iron tip I used was a little too big as well. Just proximity seems to have made a mess of the pcb near the vmod.

I used a 25w cheapo weller and a pin for the mod.

I bridged 2, 4, and 5. This gave me a bridge on 1,2,3,4,5,and 11

All said and done, under load, I achieved 2.13v mem and 1.22v core with the mod. Idle is 2.11v mem and 1.05v core.

[Brama]

Just cleaned up my gtx285 mod and I want to share. Initially I had the points bridged with solder only, but it seemed half-assed IMO.

So, this morning, I cannibalized an old sprint cell phone (circa 2001) to get some zero ohm resistors of the correct size.

Here's what I got... (blue resistors are the ones I added)

Please pardon my amateur soldering skills as well. I only have experience making rc car batteries and working on far bigger stuff.


From looking at it, I am guessing the soldering iron tip I used was a little too big as well. Just proximity seems to have made a mess of the pcb near the vmod.

I used a 25w cheapo weller and a pin for the mod.

I bridged 2, 4, and 5. This gave me a bridge on 1,2,3,4,5,and 11

All said and done, under load, I achieved 2.13v mem and 1.22v core with the mod. Idle is 2.11v mem and 1.05v core.

Good idea, using 0 ohm resistors.
To have some tenth of mV more, you can try to solder the 12 bridge too, but with the right solder.

[andressergio]

Just cleaned up my gtx285 mod and I want to share. Initially I had the points bridged with solder only, but it seemed half-assed IMO.

So, this morning, I cannibalized an old sprint cell phone (circa 2001) to get some zero ohm resistors of the correct size.

I used a 25w cheapo weller and a pin for the mod.

I bridged 2, 4, and 5. This gave me a bridge on 1,2,3,4,5,and 11

All said and done, under load, I achieved 2.13v mem and 1.22v core with the mod. Idle is 2.11v mem and 1.05v core.

Welcome nkresho to this nice thread !!!

Good luck on your mod
Sergio

[nkresho]

Good idea, using 0 ohm resistors.
To have some tenth of mV more, you can try to solder the 12 bridge too, but with the right solder.

Thanks. I did have solder bridges on it, but I think this looks so much better. They were kinda blobby looking.

Thanks for the tip, but I think I am going to keep it where it is for now. I don't expect to get much more of a gpu overclocking itch any time soon. I'm really happy with where my system is at the moment. I know that's not the "Xtreme Systems" thing to say...

It's working perfectly for my needs. I am running FTW flashes on both cards. I can get them up to 780 core-1687 shaders-1440 mem

They're under full cover koolance blocks, in a dedicated gpu loop, so heat won't be a problem.

Welcome nkresho to this nice thread !!!

Good luck on your mod
Sergio

Thanks andressergio

[Kain665]

Guys, quick question - I picked up a used 285 with the step one mod already bridged. However, once I get past a certain clock (774/1620/1404), I get a solid color screen under load. My temps are acceptable, top out at 52c with crysis. No artifacts or anything, just a solid color screen out of nowhere, windows does not freeze. any ideas? I think this may be OCP, right?

[Brama]

Guys, quick question - I picked up a used 285 with the step one mod already bridged. However, once I get past a certain clock (774/1620/1404), I get a solid color screen under load. My temps are acceptable, top out at 52c with crysis. No artifacts or anything, just a solid color screen out of nowhere, windows does not freeze. any ideas? I think this may be OCP, right?

Right, you need OCP mod.

[Kain665]

Well I penciled it down to 8k ohms and then to 7k ohms, yet my load Vgpu is still 1.215v...

Yep, 5k and still 1.215v. Any ideas?

Step 1 is bridged with conductive ink (how I got it), but there is no resistance between the pins... I can re do it with solder, but i'm lazy and am pretty sure that's not the cause.

[NapalmV5]

some 285s dont gain as much as others from step 1

still give solder a shot

lazy?? no gain!!

- remove the ink
- leave it as is and measure vgpu @ load
- solder vacancies @ 1/2/3/4/11/12
- measure vgpu @ load

[Kain665]

some 285s dont gain as much as others from step 1

still give solder a shot

lazy?? no gain!!

- remove the ink
- leave it as is and measure vgpu @ load
- solder vacancies @ 1/2/3/4/11/12
- measure vgpu @ load

I'll try it out tomorrow, but even if it wasn't a good connection - why does lowering the resistance of the resistor not have any effect on Vgpu? From stock (9.8k ohms) to 5k, it stayed at 1.215v...

[NapalmV5]

^ you tell me kain/anyone.. cause i certainly didnt use magic pencil @ step 2 to increase vgpu.. just your ordinary #2 pencil

1st 285 i got .05v increment
2nd 285 i got .08v increment

anyways.. if step 2 doesnt work for you..

heres the new step 2 vgpu mod

step #2
- for those of you that dont want to do step 1
- bridge 2 vacant from factory


- for those of you that dont want to do step 1
- 1/2/3/11 bridged from factory


- for those of you that still want to do step 1
- for those of you not gaining much @ step 1
- for those of you that have already done step 1 and want to take it a bit further
- 1/2/3/4/11/12 bridged

[Brama]

Very interesting.
On WE I decided to try Crotale voltmod but if it fails or I am not completely satisfied, I will try your new step #2.

[NapalmV5]

its not a new vmod.. been posted for a year over here

http://www.xtremesystems.org/forums/...0&postcount=66

[Kain665]

Resoldered the connections, still 1.215-1.216v under load... darn darn

[Brama]

Resoldered the connections, still 1.215-1.216v under load... darn darn

I see that you are enough skilled with the solder, so I suggest Crotale mods that seem to work on every 285s.