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post #1261 of 1336
Quote:
Originally Posted by CL3P20;14628939 
Gigabyte6870-202-580x459.jpg
chl_8214-494x580.png
chl_8266_2-460x580.png
diagram-532x580.png

vmem mod
P11808041-580x499.jpg


source

Thanks! I am wonder why MSI afterburner do not alow V increase.
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post #1262 of 1336
the bios would be to blame..as the IC is control-able with software.

*should be able to flash the firmware on teh CHil IC too, to get rid of 'cold-slow' and OCP too
post #1263 of 1336
nope. It have totaly different v controler named ADP4100.



http://www.onsemi.com/pub_link/Collateral/ADP4100-D.PDF
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post #1264 of 1336
Quote:
Originally Posted by pal View Post
nope. It have totaly different v controler named ADP4100.
http://www.onsemi.com/pub_link/Collateral/ADP4100-D.PDF


Attachment 225242

FB = pin#18 from your pic->resistor c5078 ..directly under the '5'
RT switching Frequency = pin#13
OCP = pin#9

there are separate pins for VRHOT and TTSense that control thermal monitoring/throttling.. those may need modding if you are freezing the GPU and running into 'coldslow' issues you cannot overcome by editing the BIOS.
Edited by CL3P20 - 8/20/11 at 2:08pm
post #1265 of 1336
Thanks.
So, FB -pin#18 to ground is for vgpu
What is RT-pin#13? Is there a need to do something with this.
I belive I will not need OCP, this v controler goes till 1.6V. Far enough think.
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post #1266 of 1336
Quote:
Originally Posted by pal View Post
Thanks.
So, FB -pin#18 to ground is for vgpu
What is RT-pin#13? Is there a need to do something with this.
I belive I will not need OCP, this v controler goes till 1.6V. Far enough think.
Sadly, the ADP4100 isn't that simple. To get much above 1.2v, you'll need to work out a VID mod.
    
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post #1267 of 1336
the VID mod points are directly below the markings : r5286 & r5249 in your pic.. its a row of empty pads. Start at the 4rth pin in from teh left [in your pic]..that is VID0. Looks like 3x of the contact points are on the backside of the PCB [there are 7x VID pads total.. 4x on the front and 3x on the back. Use the PDF to find the order of how to short them together for different VID combinations.

ie- shorting pins 0, 4 & 5 = ~1.3v GPU

*RT Switching freq may be helpful once you start pushing higher VID to the core..and faster core freq.
post #1268 of 1336
pro tip on ADP4100:

do not use RT mod and try to push 1.45v because a mosfet WILL explode! I know from experience.
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post #1269 of 1336
Quote:
Originally Posted by wumpus View Post
pro tip on ADP4100:

do not use RT mod and try to push 1.45v because a mosfet WILL explode! I know from experience.
Werd.. mine died silently after RT mod.
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post #1270 of 1336
what kind of switching freq were you using? ..I usually just half the stock the value, which will double switching freq. Much more than that though, and yeah you risk blowing fets for sure.

-switching freq is used to 'tune' your power output..but as response increases, amperage supply decreases. <-This is why it is important not use a high freq. in combination with high current demands.. power phases will go 'ka-put'.
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