XFX GeForce 8400GS

[mAlkAv!An]

Hi guys,
I just want to share an easy pencil voltmod for XFX' GeForce 8400GS 265MB.

First step is to find the IC "SC2621":

http://www.xtremesystems.org/forums/attachment.php?attachmentid=90673&stc=1&d=1229148984



As you can see there, Pin5 is the FB which also controls the GPU voltage. Original resistance should be exactly 600Ohm; Vgpu ~1.3V.

http://www.xtremesystems.org/forums/attachment.php?attachmentid=90674&stc=1&d=1229148984


In the area around the IC SC2621 can be found a resistor with same resistance, this has to be penciled in the following.
The measure point is just some cm next to it:

http://www.xtremesystems.org/forums/attachment.php?attachmentid=90675&stc=1&d=1229148984

Of course you can also solder a variable resistor(20k) between Pin5 of the IC and Pin9(GND).

Some settings I've tested myself:

600Ohm - 1.32V
500Ohm - 1.5V
484Ohm - 1.56V


This voltmod gave me a big boost of 170Mhz GPU and 232Mhz shader clock :)



Greetings
malk

[MajkY]

any benchmarks ?

[Riggs]

Images dead?

[Vatos_locos]

what is the resistant from the fb to ground ? solder a trimpot there and do some real mod :)

[mAlkAv!An]

It's 600 like I already sad in my post and marked on the picture. Soldering is not the problem I just thought an very easy vmod via pencil would be nice too :)


@MajkY
After modding my card I could run 3DM03 @ 769/1728/490 with stock cooler. But for real tight scores it would need better mem clocks.


Edit: pics uploaded on the server

[SupeRClockeR]

Great!