vMod-requests and general discussions

[Doug2507]

Noob question as i'm just away to get into modding so please don't flame, but, where do i find data sheets? Looking for GTX 570 SOC as i can't dig up any volt mods for it online....

[lanbonden]

Noob question as i'm just away to get into modding so please don't flame, but, where do i find data sheets? Looking for GTX 570 SOC as i can't dig up any volt mods for it online....

 

First identify the ICs on the card, and then just google the data sheet for it.

[Doug2507]

Thanks Ian.

[Doug2507]

Request

 

Gtx 295 dual pcb

 

OCP/OVP

 

VT 1165M

 

Data sheet:

 

http://wk.baidu.com/view/567ff9791711cc7931b7166f?pcf=2#9

 

Black screen anything much over 1.25v

 

Thinking VID mod to raise OVP...?

 

Any other info needed, pcb pics, v/ohm values I can sort this evening.

 

Also need to ask if worthwhile doing cap mods and if so, how to check value of caps needed. (Not just general one size will do)

Edited December 10, 2015 by Doug2507

[Doug2507]

NVM. Sorted.

Edited December 10, 2015 by Doug2507

[willemc700]

I am looking for the 260gtx lightning ovp/ocp mod. I known there is one.. I just keep on hitting dead links..

[Doug2507]

Rare gpu!

[d0minat0r]

regards

[willemc700]

Thanks for the quick reply on Christmas day.

[mllrkllr88]

Maybe someone here can help me. I am looking for the datasheet for the Volterra VT1165MF but I cannot find it anywhere. I ether need the datasheet or OCP/OVP mods for 9800GX2 because this thing is triggering at 1.25v.

[basco]

http://www.rom.by/files/vt1165mfqx.pdf

 

maybe this helps too??

http://forum.hwbot.org/showthread.php?t=93981

 

or maybe ask "der8auer"

Edited April 3, 2016 by basco

[mllrkllr88]

I dont know where you found that but thanks a million basco!!!

[nachtfalke]

the mod from gtx260/280 " about OCP " has nothing to do with OCP;) , as we read the datasheet has to do with R_Ref( pin30 reference resistor use to calibrate) and R_Sel ( pin31- the range select pin)

 

the pins that has to do with UVP and OCP/OVP is pin 24 and pin 25 , you should lowered the resistance R2003 from 10k to 8K or 5K( but i don´t recomanded if you don´t change the coil inductors and cooled very well the mosfets) that has to do with OVP , and R2001 for UVP!

Edited April 3, 2016 by nachtfalke

[Splave]

Sounds like a nightmare

[GtiJason]

That's a walk in the park for Miller Killer double snowmen, if only I had half the skills of an EE

[xxbassplayerxx]

David, I have a datasheet in my files too. Link in case it's different.

 

https://www.dropbox.com/s/4i5v96vqfc63iak/VT1165M_PROGRAMMABLE_REGULATOR.pdf?dl=0

[newlife]

Does anybody know if the vfb pin is the same thing as fb

 

IC in question is ncp81174 from a Gigabyte 950 Xtreme Gaming

[elmor]

Does anybody know if the vfb pin is the same thing as fb

 

IC in question is ncp81174 from a Gigabyte 950 Xtreme Gaming

 

On this part I recommend adjusting the REFIN pin. Essentially the voltage on this pin will be the output target voltage. Try to identify the resistor connected between REFIN and VREF pins and lower the resistance by soldering a VR in parallel. Check Figure 2 for an overview.

[newlife]

On this part I recommend adjusting the REFIN pin. Essentially the voltage on this pin will be the output target voltage. Try to identify the resistor connected between REFIN and VREF pins and lower the resistance by soldering a VR in parallel. Check Figure 2 for an overview.

 

Thanks for that and would I be right in assuming it's the same as with fb and I use a VR 20x the resistance or would it be different?

[elmor]

Thanks for that and would I be right in assuming it's the same as with fb and I use a VR 20x the resistance or would it be different?

 

Yeah 20x the resistance between those two pins should work well.

[newlife]

Yeah 20x the resistance between those two pins should work well.

 

I just found out no need to do the gpu after soldering a V read point I found out changes past 1.275v done by bios take effect it's just Gpu-z stopping at 1.25v

 

Oh and max I can set by bios is around 1.6v

[newlife]

On this part I recommend adjusting the REFIN pin. Essentially the voltage on this pin will be the output target voltage. Try to identify the resistor connected between REFIN and VREF pins and lower the resistance by soldering a VR in parallel. Check Figure 2 for an overview.

 

I just tried this and decreasing the resistance lowered the voltage

 

Edit: just to make sure I did right I had a trimpot connected from point marked in red to ground

 

Edited May 10, 2016 by newlife

[elmor]

I just tried this and decreasing the resistance lowered the voltage

 

Edit: just to make sure I did right I had a trimpot connected from point marked in red to ground

 

 

Yes this will lower the voltage. I said in parallel with the resistor between VREF and REFIN, not from REFIN to GND. See below.

 

[newlife]

Yes this will lower the voltage. I said in parallel with the resistor between VREF and REFIN, not from REFIN to GND. See below.

 

 

Forgive my idiocy and just redid it and it worked

[VanBudd]

Hey i just desoldered the powersection of a 8800gts 512 to get a powerboard on it.

I measured the resistance of the vGPU points and there were just 0.5-0.6Ohm.

Is this still ok or do you think i shorted something?

I heard under 0.5Ohm its mostly a short.

Edited May 12, 2016 by VanBudd