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8400GS Vgpu pencil mod 8400GS Vgpu pencil mod
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8400GS Vgpu pencil mod
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Old 10th December 2008, 17:46   #1
mAlkAv!An
 
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Default 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
Attached Thumbnails
8400gs-vgpu-pencil-mod-8400gs_vmod_1.jpg 8400gs-vgpu-pencil-mod-8400gs_vmod_4.jpg

Last edited by mAlkAv!An : 25th April 2009 at 10:07.
 
Old 10th December 2008, 19:44   #2
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Thanks, nice addition for the 8400GS overclocking article: http://www.madshrimps.be/?action=gethowto&howtoID=76
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Old 10th December 2008, 19:57   #3
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Nice article, didn't see it before
Btw, my card topped out at 769Mhz(gpu)/1782Mhz(shader) @ 1.56V with stock cooler
 
Old 10th December 2008, 20:20   #4
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The stock heatsink is worth nothing Go for VF1000 after market heatsink, can be used on many videocards so no lost money there.
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Old 11th December 2008, 02:14   #5
mAlkAv!An
 
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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
 
Old 25th April 2009, 10:05   #6
mAlkAv!An
 
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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





 
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