8800s OVP Mod ......

[giorgioprimo]

George, i looked all around the web but for me is difficoult to find the value you raccomanded,

may you please indicate the right component ( or something similar ) here
or here ?

Thanks

Link doesn't work....Get some .68uH at 25A+ each (at 25*C).....

[hipro5]

George, i looked all around the web but for me is difficoult to find the value you raccomanded,

may you please indicate the right component ( or something similar ) here
or here ?

Thanks

Hmmm......They don't have some with so high current.....
Tell you what.....Find a burned ABIT IC7 mobo and unsolder it's VCore chokes....

[giorgioprimo]

have found some 50uH or 19uH 25A, is ok or i need abosolutly .68uH ? ( sorry but I don't understand wat uH value, means )

[hipro5]

have found some 50uH or 19uH 25A, is ok or i need abosolutly .68uH ? ( sorry but I don't understand wat uH value, means )

NO - NO - NO ...... NOT xxuH......You NEED 0.68uH - NOT EVEN 1.0uH

[Johnny Bravo]

George this mod based on the vmax terminal?

http://www.primarion.com/PrimarionMa...s/PDB-3540.pdf

[TiN_]

I'm not George, but yes, think so.

George this mod based on the vmax terminal?

http://www.primarion.com/PrimarionMa...s/PDB-3540.pdf

[Xtasy]

hey i have a small problem, well i did the your mods to some 8800 GTX and the smd for vgpu fell off. there aren't solderpoints anymore so i cant solder the smd back on board. how do i manage to bridge that ing smd :/

[hipro5]

George this mod based on the vmax terminal?

http://www.primarion.com/PrimarionMa...s/PDB-3540.pdf

Yes Johnny.....BUT there MUST be a little Vdroop on the VGPU so NOT to produse to high VSpikes so to work properly....

hey i have a small problem, well i did the your mods to some 8800 GTX and the smd for vgpu fell off. there aren't solderpoints anymore so i cant solder the smd back on board. how do i manage to bridge that ing smd :/

Hmmm.......Now you're screwed....
....now you HAVE to find the "line" that goes onto the VCore leg of the chip and solder on it - NOT YOU, ask for someone else to do this for you j/k - ......

[wittekakker]

NO - NO - NO ...... NOT xxuH......You NEED 0.68uH - NOT EVEN 1.0uH

Why not? Frequency related?

[Johnny Bravo]

Yes Johnny.....BUT there MUST be a little Vdroop on the VGPU so NOT to produse to high VSpikes so to work properly....

Very true Did you have any luck getting the full datasheet?

[hipro5]

Very true Did you have any luck getting the full datasheet?

Unfortunately no.... or else I could see if I could sovle the "VDroop problem".....

[dinos22]

Very true Did you have any luck getting the full datasheet?

it's under NDA and they won't release the data
i tried a few months ago

[Johnny Bravo]

gutting wondered if we were all in the same boat

[T_M]

Well it seems i have nothing better to go on (no other people trying it) so ill just have to try my luck and redo the mod, but without being able to measure the resistance.

Hipro, approximately how many turns down in resistance on your 25 turner did you have to make to get the ~5.1K reading?

[oohms]

Found the resistor for the 8800GT:

[7499richard]

So does this mod help anybody?

Reading the posts it does not really seem so...

Is there anyway to get a linear supply at say 1.6//1.7//1.8 volts and power the core with that? That is really what is needed to get nice clean dc to the core and then I am sure the MHz would sore, and so would the stability....

[wittekakker]

So does this mod help anybody?

Reading the posts it does not really seem so...

Is there anyway to get a linear supply at say 1.6//1.7//1.8 volts and power the core with that? That is really what is needed to get nice clean dc to the core and then I am sure the MHz would sore, and so would the stability....

X38 mainboard PWM should work out very well

[7499richard]

well I don't no too much about completing the mod, but I am an electrical technologist and we use linear power supplies...such as a techtrol, to supply analog equipment to ensure accurate reference voltages. The voltage does not fluctuate under load and it stays very "clean". With a scope meter the wavforms will stay nice and flat with varying loads. And that is exactly what is needed for the gpu to operate consistently and stable.

And looking at a video card the circuitry is not capable of providing what is needed.

Any thoughts from anybody?

[wittekakker]

1,6V 100A, think you're left behind building one yourself.

[7499richard]

I dont follow what your post meant. 1.6v, 100A, is that supposed to be the ratings of such a power supply?

Where does 100A come from, I must totally misunderstand what your post mean because if 100A went through any part of the card it would break?

Anyway even if you found say a 3V supply, or a 5V supply you could set yourself up a series circuit with some big resistors to drop the voltage down. Use a big heatsink and a couple fans to deal with the heat.

Is this a legitimate solution? What kind of current would an 8800GTX's core draw at say about 1.7V and 760...800MHz core speed?

[wittekakker]

I dont follow what your post meant. 1.6v, 100A, is that supposed to be the ratings of such a power supply?

Where does 100A come from, I must totally misunderstand what your post mean because if 100A went through any part of the card it would break?

Anyway even if you found say a 3V supply, or a 5V supply you could set yourself up a series circuit with some big resistors to drop the voltage down. Use a big heatsink and a couple fans to deal with the heat.

Is this a legitimate solution? What kind of current would an 8800GTX's core draw at say about 1.7V and 760...800MHz core speed?

The standard Primarion PX3540 is made to handle up to 200A, looking at the other main components, I'd say +100 Ampére is a possibility when pushing the GPU to the maximum.

[7499richard]

ok i totally disagree with you and you need to give more of an explanation as to where you come up with these current figures.

Have you ever seen a cable that is designed to carry 100A? Its not a tiny little kiddie cable, like the components on a video card, there is no way a video card has that kind of current travelling through it. Do you realize how hot it would get?

Maybe I am totally wrong but everything I have seen out in industry tells me that there is no way there is anywhere near 100A going through a video card.

[hipro5]

The standard Primarion PX3540 is made to handle up to 200A, looking at the other main components, I'd say +100 Ampére is a possibility when pushing the GPU to the maximum.

OVER 140A at 1.65Volts and 1GHz Core...

[7499richard]

i dont understand this at all

can someone convince me, there is nothing on the card that can carry 100A, so this makes no sense to me. The core is drawing that current from somewhere on the card so the current is traveling through the card to get there

[wittekakker]

ok i totally disagree with you and you need to give more of an explanation as to where you come up with these current figures.

Have you ever seen a cable that is designed to carry 100A? Its not a tiny little kiddie cable, like the components on a video card, there is no way a video card has that kind of current travelling through it. Do you realize how hot it would get?

Maybe I am totally wrong but everything I have seen out in industry tells me that there is no way there is anywhere near 100A going through a video card.

At 220V, yes, things would be different, but we are talking about only 1 and a half Volts here. Ever woundered why so much people use water to cool their processors instead of air, because the things produce over 100 Watt overclocked, devided by the that 1,5V.....