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XFX XXX 7900GS Volt Modding

B

BTK

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I want to volt mod my 7900GS. It's the 600M XXX Edition. Stock factory clocks are 600/1,600 MHz.

The RAM (Hynix 1.4 ns) clocks well so I want a VGPU.

http://img201.imageshack.us/img201/66/3d05bn5.jpg

That's mine.

That's not stable. It runs stable @ 610/870 (1,740 MHz)

http://www.xfxforce.com/web/product...rce™+7900&productConfigurationId=687681

I can't use any 7900GS/GT guides because the PCB is different.

It looks like this.



That's not mine. But that's what it looks like. That's the 450M version.

---------

So I got the codes from the voltage regulator chips.

APW7067N
A19U1 = same as ISL6549

63H2DXK_G4
ACT08

4410
BE6S1K

4420
BA6V13

The only one I could find solid info on is the first one.


APW7067N
A19U1

http://pdf1.alldatasheet.net/datasheet-pdf/view/149550/ANPEC/APW7067N.html

http://img54.imageshack.us/img54/6607/fffyv7.jpg

http://img519.imageshack.us/img519/4002/fffffcu8.jpg

It seems that it has to do with OCP and what not and will not help my vmodding :(

--------

The only other code I kind of found in on was 63H2DXK_G4
ACT08

http://www.alldatasheet.com/view.jsp?Searchword=ACT08

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If I could fine the regulator that is for vmem and vgpu I could use a pencil or solder and get a multimeter.

The 450M has RT regulators and mine doesent which is even worse for me.

--------

See what a vmodded 7900GS can do.



Help would be appreciated.

........

came from here

http://forums.techpowerup.com/showthread.php?p=445737#post445737
 
I

insider

Guest
Firstly I can barely see the PCB layout clearly and you will need a high resolution image of the back of your cards PCB, secondly you are posting in the wrong forum for this, try a modding forum like xtremesystems or vr-zone instead.
 
B

BTK

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i dont have a camera but i got all the important stuff..........the codes on the voltage regulators and thats what you need
 
I

insider

Guest
You can find the PDF files for those chips but you still need to study the PCB layout to see how XFX has implemented it since it's a non reference design PCB.
 
B

BTK

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ill worry about that ones i get the pdf's "if" i get the pdfs

thats where ill use the multimeter to check the resitors to find the right one

right now i need helpw ith pdf's and the codes i got
 
N

Namslas90

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BTK, check this thread, it starts out with one card then switches to another. I think the second card is yours. The voltmod is in there, but only 2 posts, not much more info. There is one post that is intresting, its the one about measuring pin 4 of awg's. I think thats the key you are looking for.

http://forums.vr-zone.com/showthread.php?t=93662#Scene_1

:toast:
 
B

BTK

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I

insider

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I assume you already know how to increase VGPU.

I'm not 100% sure which pin we use here to defeat the OCP protection:

You could try measuring resistance between the Phase pin (pin 13, pin is used to monitor the voltage drop across the lower MOSFET for OCP) and the resistors right above the Anpec controller to find out which one is connected to this pin. Once you have found the resistor try penciling it to see if that increase the OCP limit.

Failing that the FS_Dis pin (pin 16) and the resistors above the controller.

Try this at your own risk, I'd recommend you get a 2nd opinion at vr-zone or xtremesystems first to avoid the card going kaput... :D
 
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