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snake8282
Journeyman III

Radeon 7970 minimizing memory clocks

Hello.

I'm using Radeon7970, catalyst 12.10, APP SDK 2.8, RHEL 6.4

I need to minimize memory clocks of Radeon 7970 and keep core clocks defaults. I use aticonfig --odsc=925,150 to change memory clocks to it's configurable minimum. It succesfully changes core peak and memory peak. But when GPU load appears, memory clocks automatically become 800 MHz. What is the real configurable clock ranges? What is the available core/memory clocks ratio?

What is the way to keep memory clocks minimized?

When I used Radeon 5970, aticonfig was working perfectly for these purposes.

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3 Replies
sudarshan
Staff
Staff

Re: Radeon 7970 minimizing memory clocks

Hi,

The clock speed depends on GPU load and temperature and there is no guarantee that the clock speed will be changed as per specified in aticonfig command. Here is what man page says

--odsc, --od-setclocks={NewCoreClock|0,NewMemoryClock|0}

  Sets the core and memory clock to the values specified in MHz

  The new clock values must be within the theoretical ranges provided

  by --od-getclocks. If a 0 is passed as either the NewCoreClock or

  NewMemoryClock it will retain the previous value and not be changed.

  There is no guarantee that the attempted clock values will succeed

  even if they lay inside the theoretical range. 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.

Thanks,

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snake8282
Journeyman III

Re: Radeon 7970 minimizing memory clocks

Hello, Sudarshan.

Thanks, but a have already read man for aticonfig. Many times...

I need to set memory clocks LOWER than default settings.

It will not lead to increasing temperature.

And on the contrary, lower clocks can facilitate conditions of GPU.

I think there is some boundaries for ratios of core clocks / mem clocks...

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sudarshan
Staff
Staff

Re: Radeon 7970 minimizing memory clocks

Hi,

Looks like even if you try to lower the clock, the speed take into consideration GPU speed and temperature. There does not seem to be a way for its guaranteed control.

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