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How to add fan control to an HD4670? (hardware mod, not CCC tweak)

TrentZ

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#1
I'm trying to control the fan of an ASUS EAH4670. Since out of the box it can't control the fan, I disassambled the BIOS using Atomdis and using an hex editor added the corresponding command table to it (#39, SpeedFanControl). Still, the card can't change it's fan speed. I guess something i's lacking in the PCB, and from this guide I think that maybe it's possible to add the component that is lacking. The problem: I have no idea about electronics! I would very thankful for any help/pointers.


PS: Here is a photo of the front & back of the reference PCB from ATi.
 

PVTCaboose1337

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#2


So you cannot just change it in the CCC?
 

TrentZ

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#3
No, even with ASUS SmartDoctor.
The BIOS that came with the card had the SpeedFanControl command table empty.
 
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#4
How about a Zalman Fan Mate 2 fan controller?
 

TrentZ

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#5
That's exactly what I'm using right now, but I would prefer the speed adjusted to the temperature instead of being fixed. I'm getting something like 77º avg/78º max with Furmark using the fan mate.
 
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#6

TrentZ

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#7
There are some 4670s that have fan control, for example the PWC and the Sapphire GDDR4.
 
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#8
rivatuner