XFX 8400GS Vgpu & Vmem mod
 

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

First step is to find the IC "SC2621":





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




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:



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

Thanks, nice addition for the 8400GS overclocking article: http://www.madshrimps.be/?action=gethowto&howtoID=76

Nice article, didn't see it before :)
Btw, my card topped out at 769Mhz(gpu)/1782Mhz(shader) @ 1.56V with stock cooler:mad:

The stock heatsink is worth nothing :D Go for VF1000 after market heatsink, can be used on many videocards so no lost money there.

The problem is not the cooler but the screw holes distance - no standard on the XFX one.
Otherwise I would have installed my Accelero S1 :)

Hi guys,

just want to share a little update according to this voltmod.
I made some new better pictures & guidlines after doing the vmem mod too :)