ATI 3850/3870 Voltmod thread

[ceemic]

Pyvoman, hard to do, if we can't find IC's datasheet...

[Pyvoman]

Are talking about this http://ceemic.pri.ee/hardware/datasheets/L6713A.pdf ?
or we need something else?

[ceemic]

Ups, I had allready forgotten the IC You had. Then it can be done, I hope.
Try to look where pin33 heads.

[chefnr1]

Hi! Ihave a pair of Sapphire HD3870 512MB TOXIC, and i have checked on VGPU-mod on a non TOXIC card and there are not the same soldering point as the red card.
Could someone that know the point and mark them out for me, and if i can use the same vrpot as the red card..

This is the usual HD3870 512MB
Core Clock 777 MHz
Memory Clock 1126 MHZ GDDR4

And this are my HD3870 512MB TOXIC, plue pcb.
Core Clock 800 MHZ
Memory Clock 1152 MHZ GDDR4
Im not that sure wich point to solder on..
Clickable..
It's not that bright pic but the solder point are to see.

Br
chefnr1

[ceemic]

chefnr1, layout is almost the same. You can use DMM to check the points that are connected to pin13.
These I could see in that bad picture: http://ceemic.pri.ee/hardware/hd3870_toxic.jpg

Good luck!

[chefnr1]

Thank you ceemic! all spots and pin13 that you marked red for me are show 5.10K even that spot i marked yellow., so i think i can use either 2 of the spots at the wright side on the pic and i se that the yellow one seems to be easyer to solder on.
And i think i can use VR-pot 100kOHM to get the volt setting..

[ceemic]

chefnr1, that yellow is also connected to pin13 or is it GND?

[chefnr1]

The yellow have the same value as the redmarked and pin13, so it's not GND..

[ceemic]

Ok, I got it
So they all have 5,10kohm resistance between GND? Then 100k VR works fine.

[chefnr1]

Yes thats right 5,10Kohm on all, so i think that 100K VR should work.
Thanks for all answer will post when i done the mod on both card..

Br
chefnr1

[chefnr1]

Some results after i done VGPU mod on my both card , most i run gpu was at 1000Mhz with stockcooler..



And here are the mod taken when runnin 3Dmark..



When i run at 1000Mhz gpu was set to 1.5v..

[Misko78]

Hello everyone,

I have 2x3850 Gainward non-reference cards from post 924 in this thread, and i would like to squeeze most out of them in CF but i need same help with two things:

1. Can't remove Overdrive limit. I have tried everything but no success. I get higher values but when i try to test custom clocks activity stays at 0% and testing screen is testing indefinitely. When i try other bioses as well as ones Renegade and DoDo1 where talking about i get the same thing.

2. I would like to do pencil voltmod and vmem mod for now and afterm my warranty expires i will do solder mod. Here are the pictures so if someone can tell me what to do. Thanks



Attached below is original BIOS

[Misko78]

After posting i found out on some Russian site that this Gainward is identical to Palit, so i force-flashed 3870 DDR3 bios into both of my Gainwards and they work on 780/950 setting . Overdrive max is now changed to 830/1000, not quite what i want but i'm much more satisfied then before.

[Misko78]

With little help from monteboy i found feedback pin for BS-9M as well as VMOD points.

[Misko78]

Unfortunately my Gainward died last night. Vmod and vmem were successful as i had it going at ~930@1,44V for core and ~1070@2,05V for memory. I was benching it for more than three hours without any problem. It was cooled with VF900 and with heatsinks on RAM and fets. Core temperature was around 85°C while doing 3dmark05 and 3dmark06. power fets where very warm but not hot at all. After, what i thought was a successful overclock, while i was playing with fan controller in RT i got thin black stripes on gray screen. I turned off computer immediately. When i turned it on card was completely dead. RIP

[NapalmV5]

http://www.iax-tech.com/video/3800biosmod/03.htm

i got an inquiry to this^ bios which i dont have anymore nor the 3870s.. if you guys still have 3870s or bios files you could share.. please upload/post here

thanks

[Random Murderer]

i got an inquiry to this^ bios which i dont have anymore nor the 3870s.. if you guys still have 3870s or bios files you could share.. please upload/post here

thanks

I believe I still have my folder full of 3870 BIOSes that I modified in my OC folder, I'll check when I get home from work.
In the meantime, have a look through TPU's VGA BIOS Collection.

[felix_w]

Request was done from me, thank you both NapalmV5 and Random Murderer for your response.

Meantime i flashed this one, working flawlessly...

@Random Murderer, i'll be watching this thread...if you find the requested in your folders... thank you again.

[Random Murderer]

Request was done from me, thank you both NapalmV5 and Random Murderer for your response.

Meantime i flashed this one, working flawlessly...

@Random Murderer, i'll be watching this thread...if you find the requested in your folders... thank you again.

Not only do I still have my folder full of modified BIOSes, but I have those two from IAX Tech.
Problem is that the XS attachment system isn't letting me upload them. It says to click the "Add Files" button, but there is none.

[felix_w]

Any progress with that ?

Thx

[Random Murderer]

Any progress with that ?

Thx

I sent you an email at the address specified in your PM with the two IAX BIOSes and the PLL fix BIOS. You had said you would upload them to a fileshare server and post the link or something along those lines.
EDIT: Ah, I just checked and your email had rejected it. shoot me another PM and we'll figure something out.

[felix_w]

IAX Tech Bios's found here :

http://www.techpowerup.com/forums/sh...ad.php?t=48544

Thanx !