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Author Topic: Underclocking 6990 memory on Linux  (Read 1224 times)
frownyface
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July 27, 2011, 07:29:40 PM
 #1

For anyone who has been looking for a solid, easy-to-use command line tool that properly underclocks a 6990's memory under Linux, please take a look at this thread:

http://forum.bitcoin.org/index.php?topic=25750.msg320458

This atitweak tool is great and is the only one I've found that will allow me to lower my memory clock from a command line on a 6990 without a hassle.  It's a very solid replacement for aticonfig and/or AMDOvDrvCtrl for things like over/underclocking, fan control, GPU status, etc.

My 6990s now run a lot cooler since I've been able to underclock the memory.

I can't take any credit at all for anything except stumbling across the right thread.  If the tool helps you, flip the guy some coins.
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dadittox
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July 29, 2011, 12:32:01 PM
 #2

Unfortunately it doesn't do any magic for me at 11.6 catalyst. Memory clocks can be set only 125 MHz lower than engine, as in aticonfig.

$ atitweak -m 330
Setting performance level 0 on adapter 0: memory clock 330MHz
Setting performance level 1 on adapter 0: memory clock 330MHz
Setting performance level 2 on adapter 0: memory clock 330MHz
Setting performance level 0 on adapter 1: memory clock 330MHz
Setting performance level 1 on adapter 1: memory clock 330MHz
Setting performance level 2 on adapter 1: memory clock 330MHz
Setting performance level 0 on adapter 2: memory clock 330MHz
Setting performance level 1 on adapter 2: memory clock 330MHz
Setting performance level 2 on adapter 2: memory clock 330MHz
Setting performance level 0 on adapter 3: memory clock 330MHz
Setting performance level 1 on adapter 3: memory clock 330MHz
Setting performance level 2 on adapter 3: memory clock 330MHz

$ atitweak -s
0. AMD Radeon HD 6990 (:0.0)
    engine clock 940MHz, memory clock 1250MHz, core voltage 1.175VDC, performance level 2, utilization 0%
    fan speed 100% (960 RPM) (user-defined)
    temperature 73.5 C
1. AMD Radeon HD 6990 (:0.1)
    engine clock 940MHz, memory clock 1250MHz, core voltage 1.175VDC, performance level 2, utilization 0%
    unable to get fan speed
    temperature 68 C
2. AMD Radeon HD 6990 (:0.2)
    engine clock 940MHz, memory clock 1250MHz, core voltage 1.175VDC, performance level 2, utilization 0%
    fan speed 100% (960 RPM) (user-defined)
    temperature 71 C
3. AMD Radeon HD 6990 (:0.3)
    engine clock 940MHz, memory clock 1250MHz, core voltage 1.175VDC, performance level 2, utilization 0%
    unable to get fan speed
    temperature 78 C
dishwara
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July 29, 2011, 12:51:08 PM
 #3

Have u tried with 11.7 catalyst. It was released on 27th July 2011.
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