Is it possible to change core clock speed on Amd 7870 in Linux?

[Scott Swinyard]

I know Nvidia has made that possible with their drivers.

I don't want to overclock the card. I actually want to slow it down a bit. I think Asus has slightly raised it from it's standard speed and I don't like the harsh effects it produces.

[Scott Swinyard]

Never mind. I found an app to do it.

http://sourceforge.net/projects/amdovdrvctrl/

[gradinaruvasile]

Use amdconfig. It should be able to set the card speed.

amdconfig --adapter=0 --od-getclocks

Gets the clock speeds. My card has:

Adapter 0 - AMD Radeon HD 7560D
                            Core (MHz)    Memory (MHz)
           Current Clocks :    304           800
             Current Peak :    760           800
  Configurable Peak Range : [304-760]     [800-800]
                 GPU load :    1%

The following command sets the clock speeds:
I DONT EXACTLY KNOW the numbers there, probably min and max. Look around.

amdconfig --adapter=0 --od-setclocks=770,1126

[Scott Swinyard]

Thanks. That's good info to know.

I found the app above in a repo for my distribution and it works perfectly including a script for startup.

Yeah, those would be min and max. Tell me, do you know how to make the system retain those settings across boots, and what about voltage?

[gradinaruvasile]

Honestly i dont know as i use amdconfig only for monitoring.

Here:
http://foreverrising.wordpress.com/2...eon-in-ubuntu/
Is posted about the overdrive functions:

These newly set
clock values will revert to the default values if they are not
committed using the "--od-commitclocks" command before X is
restarted

So theoretically they should stick if you commit them.

[asdfblah]

also, there is https://github.com/Glakke/glakkeclock
althought I'm not sure if it will work in 7870