mx440 8x agp vmod help

[mattsmall]

i have a gainward mx440 8x agp defalt clocks are 275core (i think) and 512mhz ram. the core has gone up to 420mhz and is ice cold so can some one give me a link on how to do the vmod to the core.
http://www.icronticforums.com/attachment.php?s=&postid=14653

[CCW]

mattsmall, WELCOME TO THE XTREME!

These arent popular overclocknig cards thus the lack of replies and volt mod guides. You might have to work out the mod for yourself in which case try looking for the vmod basics threadc. Im trying tofind it but with no luck and as soon as I have I will post a link here for you.

Craig

EDIT - The vMod Basics Thread:
http://www.xtremesystems.org/forums/showthread.php?s=&threadid=6575

[mattsmall]

thanks for the help
i found the data sheet but i dont know what im looking at.

[CCW]

Post a link and I will see if I can help but ive never done a v-mod, see if someone else can help too iuf you post us a linky please

[saaya]

the data sheet should include a drawing or a table showing what pin does what...

[CCW]

saaya, will he be looking for vcc pins?

[\/icious]

if u find out matt or antone else could u post where because i have an old one id like to tinker with

[mattsmall]

http://www.fairchildsemi.com/ds/74/74ACT08.pdf i think this is it

[saaya]

are you sure this is the right datasheet? there are many chips that have the same or almost the same part number from diferent companies...

i cant figure out the vsen pin in that pdf file...

[Dodgy-er Dave]

I also have a Gainward mx440 with the chip model number of ISL6529CB. Here is the link to the datasheet. http://www.intersil.com/data/fn/fn9070.pdf
I was wondering which is the sense pin on this chip as it doesnt actually say 'vsense' etc. I think it maybe either 'Drive2' or 'Comp' What does anyone else think??

Also what size pot should i use on it?

Cheers

DD

[Dodgy-er Dave]

Anyone at all help with the above post??

DD

[Dodgy-er Dave]

Ive had an other look on the board and their doesnt seem to be any other chips that can be used as the voltage regulators. Ive not got a multi meter to test which pin is which either and id like to have a second opinion first b4 i try anything

DD

[st0nedpenguin]

http://www.vr-zone.com/guides/NVIDIA/MX440VMod/

Dunno if that's any help, apparently it only applies to cards using the reference design though.

[Hell-Fire]

Originally posted by Dodgy-er Dave
I also have a Gainward mx440 with the chip model number of ISL6529CB. Here is the link to the datasheet. http://www.intersil.com/data/fn/fn9070.pdf
I was wondering which is the sense pin on this chip as it doesnt actually say 'vsense' etc. I think it maybe either 'Drive2' or 'Comp' What does anyone else think??

Also what size pot should i use on it?

Cheers

DD

My old Ti4200 had the ISL6529CB and I used a 200K VR on pin #9 to Ground. You can use any ground on the card, or use pin #3 as ground.

Here is the data sheet (http://www.intersil.com/data/fn/fn9070.pdf).

[Dodgy-er Dave]

Ah cheers m8. Your a life saver. Is that mod for the GPU or the mem or both?? FB is GPU i think (says 1.5v out on the data sheet) so FB2 must be the mem. Could i do the same thing with that??

Thanks again hell-fire d00d

Its a different reference st0ned m8 otherwise the mod would be str8 forward lookin at that guide. May write a guide for this card if i get the mod done satisfactory enough :)

DD

[Hell-Fire]

Is there only one Vreg on the card? If so, then most likely it is controlling both the Vgpu and the Vddr.

Honestly, I dont recall on my card, but I am fairly certain that is was indeed for the Vgpu.

If the 6529CB is regulating both voltages, then yes, you can do the same mod on FB2, but I would think that a 100K VR would do the trick for the Vddr....but use 200K to be safe I suppose.

Is it possible to post a pic of the back of the card as well as the front?

[Dodgy-er Dave]

Ah sorry sorry for the long wait for a reply. I aint got a camera to take pics of the board unfortunatley but i managed to pick up a couple of 50k variable resisitors for the job.

I also got a multi meter the other day and its quite accurate but im gonna see if i can test it more first b4 i mod.

YGPM hellfire.......

DD

[Dodgy-er Dave]

Anyone know where to measure the voltage on my mx440 with the multimeter?? need to find out how much is goin through atm.

Cheers

DD