7800GTX overclocks with Volt Mods??

[ViperJohn]

nice mod there, does lower resistance give ya higher vGPU?

victor

Yes.

Viper

[busta`]

As many here know my father has been the hospital under intensive care since Friday of
last week.

I just wanted to take the time to say Thank You to everyone who emailed with well wishes
and support and to inform them that at 10:15 PM on 7/8/05 my father slipped the surly bonds
of earth to join hands with god and take his final journey to heaven.

John Hillig
aka
ViperJohn

I recently lost someone who meant more to me than the world. I can empathize for you, and you have my deepest condolences for your loss.

[Apocalipsis]

As many here know my father has been the hospital under intensive care since Friday of
last week.

I just wanted to take the time to say Thank You to everyone who emailed with well wishes
and support and to inform them that at 10:15 PM on 7/8/05 my father slipped the surly bonds
of earth to join hands with god and take his final journey to heaven.

John Hillig
aka
ViperJohn

Really sorry to hear that ViperJohn, my most sincere condolences.

[BLHealthy4life]

Hi John.

Sorry to read about your father passing away.








Take care
Brian

[freecableguy]

This is all great stuff but I see nothing about possible OC's with the volt mod....

[Avid6eek]

Any results yet on whether or not the increased memory voltage allowed for a higher stable frequency?

[wasky]

Here's the VDD mod done by ViperJohn. Thanx for the pics, man. 100k trimmer, lower resistance for more volts.

ok for a lower resistance for more volt, but here:

http://www.xtremeresources.com/forum...ad.php?t=37362

i read this:

The Vmem mod is a 100K, 25 turn trimmer and will kick the Vmem up from 2.080 stock to 2.165 at the Windows desktop when set at 100K.

The Vcore trimmer is 200 ohms and gives a .050 bump up in Vcore at the Window Desktop when set at 200 ohms

who has reason? on FX5600 whit intersil Vdimm it was lower resistance max Vdimm


10X guys


wasky

[wasky]

I just wanted to take the time to say Thank You to everyone who emailed with well wishes
and support and to inform them that at 10:15 PM on 7/8/05 my father slipped the surly bonds
of earth to join hands with god and take his final journey to heaven.

John Hillig
aka
ViperJohn

*

my thought is for you Viper John


condolences


roberto

[ViperJohn]

ok for a lower resistance for more volt, but here:

http://www.xtremeresources.com/forum...ad.php?t=37362

i read this:



who has reason? on FX5600 whit intersil Vdimm it was lower resistance max Vdimm


10X guys


wasky

They are saying the same thing. What I wrote about the voltage is what is
obtained with the trimmers set max resistance from the start. If you want
more voltage just lower the resistance of the trim pop while metering the
target voltage when idling at the Windows desktop.

John

[IYP]

so sorry to hear about your father john...best wishes to you and your family.

about the vmod what kind of volts are you expecting to get from this?

[wasky]

10X Viper John


wasky

[Gryph]

This is all great stuff but I see nothing about possible OC's with the volt mod....

I have tried the gpu volt mod on a few cards and it does allow for higher clocks. I went from 540 to about 600 on one card and that is on air. I ended up around 1.58 volts and I am sure it would go higher if the card had better cooling.

I have yet to try the memory volt mod since I heard it doesnt really help that much and I can get 1450+ out of one of my cards without a mod.

Gryph

[ViperJohn]

so sorry to hear about your father john...best wishes to you and your family.

about the vmod what kind of volts are you expecting to get from this?

Thanks. Now it is my mothers turn. She entered into the Hospice care system today.

The voltages you can get with the mods are enough to fry the cards with you wound them tight enough.

John

[gigi77]

10X Viper John


wasky

10x

[cadaveca]

So this mod for gpu is confirmed?







I find this on my own...can we mod each voltage seperate this way???

[ViperJohn]

So this mod for gpu is confirmed?







I find this on my own...can we mod each voltage seperate this way???

You do not mod at the VID pins.

Viper

[cadaveca]

no, on the sense lines, i mean. there are 3 vid pins, and three sense pins connected, as well as 3 voltages...2d, low power 3d, and high power 3d. i'm saying mod the sense line for the corresponding VID. i don't know much about power design, but there is a place ther that can be modded just before the sense pin.



but nevermind i understand why. vid5 and 0 are constant. why bios mod does not work, i guess.

[ViperJohn]

no, on the sense lines, i mean. there are 3 vid pins, and three sense pins connected, as well as 3 voltages...2d, low power 3d, and high power 3d. i'm saying mod the sense line for the corresponding VID. i don't know much about power design, but there is a place ther that can be modded just before the sense pin.



but nevermind i understand why. vid5 and 0 are constant. why bios mod does not work, i guess.

Actually there are 6 VID pins. The way NV has the VID's setup to switch you can't get 1.500 using bios. Only 1.2, 1.3 and 1.4.

Viper

[happyhero]

my brother fried his 7800 because of this thread. he should of done more research before he did it, as this thread is limited in the helpfull department.

[Gryph]

Any volt mod is done at your own risk. I have done this exact volt mod on four of my cards and I still havent fried one. You must have adequate cooling on the whole card expecially the voltage regs. If you set the trimmer all the way to the max resistance you will get about 1.49v on the gpu the less resistance you dial in the more voltage you will get. I have ran my cards up to 1.65 volts but after I am done my tests I always back it all the way off to 1.5volt. The cards dont seem to like booting when the voltage is too high. The first time I got up to 1.58volts and I had to restart for other reasons I forgot to back off the voltage and it locked up as soon as the driver loaded and the voltage went up to 1.58 volts. SO if you think you want to overclock your card dont do the volt mod unless you are willing to fry it and void your warranty.

Gryph

[ViperJohn]

my brother fried his 7800 because of this thread. he should of done more research before he did it, as this thread is limited in the helpfull department.

Your brother fried his card not from the info in this thread but from incorrect or miss use of that information.

Viper

[cadaveca]

Actually there are 6 VID pins. The way NV has the VID's setup to switch you can't get 1.500 using bios. Only 1.2, 1.3 and 1.4.

Viper

uh, yeah...0,1,2,3,4,5 is six... only 1,2,3 seems connected tho, so the others are constant...i think. need one of those fixed others to make 1.5, correct?

what i was wondering was if the sense pins were actually sensing the three power modes or not, and whether it could be modded that way, in your opinion. you know more about gpu power implmentation than i do, so i'm not too sure what it is that the sense pins are sensing really...could be the output matched to what the VID says, in which case a resistor thrown in there might help the transition from 2d to 3d?!?

of course, i am confused....

[Gogar]

Found another piece of info through google.. Not sure if it helps any

Intersil (Milpitas, CA) will demonstrate the ISL6592 digital multiphase PWM controller IC, which can drive up to 6 synchronous-rectified buck converter channels in parallel. The device enables designers to minimize the number of off-chip components and features an I2C interface, active transient response, programmable fault levels, and a line and load accuracy of ±14 mV. (Booth #13, Circle xxx)



The evaluation board for the ISL6592 digital multiphase PWM controller IC



If i untick all 6 VID checkboxes at the bottom it says 1.550 volt.

VID5 seems to have no effect.


4 3 2 1 0
------------------
0 0 0 0 0  1.550v
0 0 0 0 1  1.525v
0 0 0 1 0  1.500v
0 0 0 1 1  1.475v
0 0 1 0 0  1.450v
0 0 1 0 1  1.425v
0 0 1 1 0  1.400v
0 0 1 1 1  1.375v
0 1 0 0 0  1.350v
0 1 0 0 1  1.325v
0 1 0 1 0  1.300v
0 1 0 1 1  1.275v
0 1 1 0 0  1.250v
0 1 1 0 1  1.225v
0 1 1 1 0  1.200v
0 1 1 1 1  1.175v
1 0 0 0 0  1.150v
1 0 0 0 1  1.125v
1 0 0 1 0  1.100v
1 0 0 1 1  1.075v
1 0 1 0 0  1.050v
1 0 1 0 1  1.025v
1 0 1 1 0  1.000v
1 0 1 1 1  0.975v
1 1 0 0 0  0.950v
1 1 0 0 1  0.925v
1 1 0 1 0  0.900v
1 1 0 1 1  0.875v
1 1 1 0 0  0.850v
1 1 1 0 1  0.825v
1 1 1 1 0  0.800v
1 1 1 1 1  0.000v

[Gogar]

First of all i'm a complete noob in this area.. so please don't shoot me..
I don't know exactly which voltages the card sets.. assuming it's 1.1 1.2 1.3 and 1.4 volt
Cutting vid 1 and 2 would cause it to set 1.55 volts whenever it tries to use 1.4v
and when it tries to use 1.1v the voltage would be 1.15. For 1.2v and 1.3v the voltage would be 1.350v.
Anybody got a clue if what i'm thinking could be correct???

Another thing..

Key Features

Multiphase power conversion
2- to 6-phase operation
300kHz to 1.5MHz switching frequency
Supports Intel® VR 10.x, AMD®, and custom VID codes
Internal high precision voltage reference
±5mV voltage setpoint accuracy
Precision digital current sense calibration
±14mV loadline accuracy
Precise digital current balancing with programmable offsets for thermal balancing
Digitally programmable loadline and loop compensation
Differential voltage sense
Digital temperature sensor compensation
Active Transient Response (ATR) enables meeting transient requirements with reduced output capacitance
I2C interface for monitoring, control and configuration
Internal non-volatile memory (NVM) to store custom configurations with four programmable system configurations
Extensive fault detection capability with two user configurable output fault pins
Input Undervoltage
Output Under/Overvoltage
High Side Short
Per Phase and Total Output Current
Multiple Internal and External Temperature Limits
NVM Configuration
Calibration Range and Time-Out
Configurable latched fault or autonomous recovery shutdown
Single +3.3V supply operation
48 lead LQFP plastic package
Commercial temperature range of 0°C to 85°C ambient

See that? I2C interface for monitoring, control and configuration
Internal non-volatile memory (NVM) to store custom configurations with four programmable system configurations

iirc the pc itself has an I2C bus, maybe hooking it up together will allow the utility you can download from intersil's site to communicate with the chip. The pins for the I2C bus should be SDA (pin 44) and SCL (pin 45).

More about I2c busses here

Now i just gotta find where the I2C pins spring from on the motherboard... Nforce4 chipset? Even if i knew that.. it's a BGA package.. On the Ultra-D what chip(s) does the I2C bus run to?

[happyhero]

Your brother fried his card not from the info in this thread but from incorrect or miss use of that information.

Viper

well i did tell him not to vmod it untill there is a guide on how to do it successfull. i am going to do my card as soon as i have enough knollege, still waiting for some one to make a guide some where on the net. over at extreme resources they know how to do the volt mod but won't tell any one.

EDIT: just found malves vmod guide and it looks good to give it a try.