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
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 biosI will go with the no.1 first.1. sudo apt-get install git libwxgtk2.8-dev
2. git clone git://amdovdrvctrl.git.sourceforge.net/gitroot/amdovdrvctrl/amdovdrvctrl
3. cd amdovdrvctrl
4. wget http://download2-developer.amd.com/amd/GPU/zip/ADL_SDK_3.0.zip
5. unzip ADL_SDK_3.0.zip -d ADL_SDK
6. make
7. sudo make install
8. AMDOverdriveCtrl << start the programYou can chage the memory clock in Overdrive tab
http://1.bp.blogspot.com/-mdAOf7aWo34/TV0kMlaVd2I/AAAAAAAABCU/jDmJOnllA-s/s320/ati_4.png(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
.
1. Save the current BIOS with GPU-Z (You can see the Save button in the same line with BIOS Version)
http://tpucdn.com/gpuz/screen1.gif2. In RBE, open your saved file
3. Change the clock settings
http://tpucdn.com/rbe/RBE_Clocks_small.png4. 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
Using the above methods, my 5870 gives me ~430Mhash/s with 1000/300 mem/core (voltage remains) and save some few Watts
.
http://img41.imageshack.us/img41/7438/screenshot20110603at352.png Refs:
Tutorial on how to use RBE (Radeon BIOS Editor) Feel free to give away something if you like my post
1AAf3a8RT8anVvomhMNovZqcZvzMpu4SAA
