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Author Topic: [GUIDE] How to underclock mem in Ubuntu  (Read 2749 times)
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June 03, 2011, 07:14:35 AM

Hi all,

I'm not sure if this has been posted before or not. I searched but didn't find something clear enough, so I decide to create one  Smiley

There are 2 ways (as I know) to modify the GPU clock/mem under Linux.
1. Use a tool to override AMD driver
2. Modify the VGA bios

I will go with the no.1 first.

1. sudo apt-get install git libwxgtk2.8-dev
2. git clone git:// 
3. cd amdovdrvctrl
4. wget
5. unzip -d ADL_SDK
6. make
7. sudo make install
8. AMDOverdriveCtrl
<< start the program

You can chage the memory clock in Overdrive tab
(The image above is from here)

By the way, using AMDOverdriveCtrl is a little inconvenient in case you have more than 2 cards. And I decide to re-flash the VGA bios with new clock settings.

I use Radeon BIOS editor, GPU-Z & ATI WinFlash Note: This is Windows tools  Angry.

1. Save the current BIOS with GPU-Z (You can see the Save button in the same line with BIOS Version)
2. In RBE, open your saved file
3. Change the clock settings
4. Save the custom BIOS, flash with ATI Winflash and there you go.

Tips: Tried to find the stable settings for my VGA first (core/mem) and then set them to default clock in BIOS. Don't need to do anything more in Linux  Smiley

Using the above methods, my 5870 gives me ~430Mhash/s with 1000/300 mem/core (voltage remains) and save some few Watts  Grin.

Tutorial on how to use RBE (Radeon BIOS Editor)

Feel free to give away something if you like my post 1AAf3a8RT8anVvomhMNovZqcZvzMpu4SAA
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June 04, 2011, 10:57:19 PM

I can't use AMDOverdriveCtrl, says Segmentation Fault Sad

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June 04, 2011, 11:04:59 PM

What about adjusting voltages on ATI cards in Linux?
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June 05, 2011, 12:31:24 AM

$ aticonfig --adapter=all --od-enable
$ aticonfig --adapter=all --odsc=###,%%% (where ###=core clock and %%%=memory clock)

FREE ROSS ULBRICHT, allegedly one of the Dread Pirates Roberts of the Silk Road
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