ATI 4850/4870 voltmod thread

[Vatos_locos]

high res pics of the card please

[rastaman]

hi,

thx for reply - here they are












http://www.abload.de/image.php?img=img_2341tw4b.jpg
http://www.abload.de/image.php?img=img_2338rnx6.jpg
http://www.abload.de/image.php?img=img_2339h8da.jpg
http://www.abload.de/image.php?img=img_2336t8u9.jpg

[D0m|nat0R]

I need OCP mod for this http://i220.photobucket.com/albums/d...intmedido6.jpg
all over 1.3 crashed sistem and give 0V on GPU

[largon]

There are two ways to do it; you can either short pins #12 and #13 (or the resistor w/ blue dots in pic below) which will completely, totally and utterly disable OCP.

OR

[recommended]
You can make a tuneable OCP mod by soldering a VR on blue dots in pic below, rated ~20× the resistance between the same blue dots:
[/recommended]

I need OCP mod for this http://i220.photobucket.com/albums/d...intmedido6.jpg
all over 1.3 crashed sistem and give 0V on GPU
http://i220.photobucket.com/albums/d...eenShot039.jpg

[D0m|nat0R]

because I'm not currently able to lemim right there is the possibility of pencil mode for this?



maybe this?

[ceemic]

D0m|nat0R, in theory You could pencil that resistor. But You have to measure it with DMM.

[D0m|nat0R]

when the measure is now down to 2, xxK om
and when we measure here looking right and GND is the other 11.3K mail, and only when you link to the NCP regulatoru pins on the right down to 0
need for the resistor that came down to 0 om_

[Tomasz25]

hello guys,
I just would like to thank you for your help!
I've moded my Saphhire HD4870











Max Vcore I tried was 1,6V, ACCELERO S1
unfortunatelly max core clock is only about 870 MHz, there is no way to cross the 900
Regards

[Mrazaq]

Hello, can you please help me which resistor to pencil on the Gigabyte HD4850 (zalman, 512MB) ? I took some pictures, .
Thanks in advance!

bumping this.

[celemine1Gig]

bumping this.

If one could read anything clearly on these pics of yours, then you wouldn't have had to ask twice. Either take new pics or just tell us what the voltage regulator is called. Then we'll see. Without any data, the only thing we can do is guess and guessing is bad when it comes to electronics.

[Mrazaq]

ok, i made some new photos - still terribad quality, but i found out the chip name, it says NCP5392 G5AD0830G which should be this one

[celemine1Gig]

ok, i made some new photos - still terribad quality, but i found out the chip name, it says NCP5392 G5AD0830G which should be this one

According to the datasheet, here

http://www.onsemi.com/pub_link/Colla...NCP5392Q-D.PDF

pin#17(VFB) is the appropriate pin. Measure resistance between pin#17 and GND (completely withot power to the card!). Would be best to find alternative soldering spots first. Soldering to those tiny contacts is bad, if there are better soldering spots.

[DavyGT]

bumping this.

The mod for this card was already found and attempted back on pages 57, 58 and 59 by ceemic and dragubogdan. Here: ceemic's mod
However, dragubogdan didn't get it to work. Maybe a second attempt will make it work?

[dragubogdan]

The mod for this card was already found and attempted back on pages 57, 58 and 59 by ceemic and dragubogdan. Here: ceemic's mod
However, dragubogdan didn't get it to work. Maybe a second attempt will make it work?

Hi guys!
That is right , I didn't get it to work using 100k vr connected to FB pin,but using a 50k vr is working fine.I recommend you to get last bios update from gigabyte.com for better temperature of the card.Regarding pencil mod I still don't know what resistor must pencil.

[Burninator]

does the vmem pencil mod for reference 4870s work for 4890s also?

[n30c0rt3x]

Hey Guys, are there any OCP Mod´s known for the 4870 in reference Design ??? Read a lot of Sites in this Thread but can´t find one...

[Tkult]

I saw you did some soldering work for these PCS+ powercolor cards.


Is there any way to do it with pencil?

I know will probably be less voltaje added, but some little more will be cool!

My card does 850-1000 without problems, more than that i have vpu recovers sometimes.

It should be possible to pencil some resistor right?

If there`s any, i would appreciate it

[Tkult]

I dont understund what resistance to shade (pencil) for vgpu???

An user posted this:
http://ceemic.pri.ee/hardware/hd4850...50_mod_pen.JPG

I have the Powercolor PCS+ 4870 512mb

Can someone edit the picture and mark what to shade with pencil? and how i mesure the vgpu? I guess that pic is for soldering need pencil

[Tkult]

Well i used the voltage factory method, and i can go up to 900mhz core with 1.4, so i guess this will be the top for my card, i wont try more than 1.4 anyways :P

[Gestler]

Hey, help me someone with vmode of 4890? this is the MSI R4890 Cyclone 880/3900 1024 megabytes GDDR5









Details

[img=http://img143.imageshack.us/img143/7195/dscf5126b.jpg]
[img=http://img266.imageshack.us/img266/869/dscf5125.jpg]



Thanks in advance

[ceemic]

Gestler, do You even need a hardmode? You can use some moded BIOS and go up to ~1,49V with software.
Sadly can't find datasheet for that IC...

[Gestler]

Bios vmode? Think that this card does not have this option does not Volterra regulator, 1.49 V to me absolutely enough, default GPU voltage is 1.353 V

[ceemic]

Try GPUTool: http://www.techpowerup.com/downloads...Preview_1.html

[Gestler]

Unfortunately, ... but thank you for your interest.

[ceemic]

Here are many users, who have access to datasheets which are not available for most of us. So lets wait and hopefully You can do hardmode.