Memory Tuning my new Gigabyte 7950

[nookiegirl]

Hi,

So this is now my actual first working rig.
I just bought a Gigabyte Radeon HD 7950 GV-R795WF3-3GD.
Upped the GPU Clock to 1100Mhz (which is the maximum) from the control Panel.

I am getting 550Mh/s at average.
Now I am a bit curious what I can do with the Memory Clock.
Is it good to lower it? And if yes to what extend?


Here is a screenshot of the current settings:

[middlemarkal]

For BTC lower it as much as you can, it will lower the temperature 

[nookiegirl]

Is there any ration I should keep between GPU clock, or could I just lower it to 150 Mhz and hit apply?

[spinx]

Have a look at my thread regarding this subject
https://bitcointalk.org/index.php?topic=204949.0

[nwoolls]

I just bought a Gigabyte Radeon HD 7950 GV-R795WF3-3GD.
Upped the GPU Clock to 1100Mhz (which is the maximum) from the control Panel.

I am getting 550Mh/s at average.
Now I am a bit curious what I can do with the Memory Clock.
Is it good to lower it? And if yes to what extend?

A few notes. Enable manual fan control, or use --auto-fan if you are using cgminer or bfgminer. In my experience if you OC the card that high and then leave it up to ATI/AMD drivers to run the fan you are going to cook things. Set the fan to 75% and your cores will run ~20C cooler.

Second, underclocking the memory clock speed in the ATI Control Panel will most likely look like it works, but not actually take effect. Use something like GPU-Z to see what your memory is actually running at while mining. If you want to underclock your memory, you'll need to use Afterburner along with a few manual tweaks found in this thread.

Right now I am using Afterburner to run my 7950's at 1175 core, 200 memory, stock voltage with 75% fan speed using the 12.8 drivers. They run at about 60C and are very stable doing 600 Mh/s a piece.

[nookiegirl]

I just bought a Gigabyte Radeon HD 7950 GV-R795WF3-3GD.
Upped the GPU Clock to 1100Mhz (which is the maximum) from the control Panel.

I am getting 550Mh/s at average.
Now I am a bit curious what I can do with the Memory Clock.
Is it good to lower it? And if yes to what extend?

A few notes. Enable manual fan control, or use --auto-fan if you are using cgminer or bfgminer. In my experience if you OC the card that high and then leave it up to ATI/AMD drivers to run the fan you are going to cook things. Set the fan to 75% and your cores will run ~20C cooler.

Second, underclocking the memory clock speed in the ATI Control Panel will most likely look like it works, but not actually take effect. Use something like GPU-Z to see what your memory is actually running at while mining. If you want to underclock your memory, you'll need to use Afterburner along with a few manual tweaks found in this thread.

Right now I am using Afterburner to run my 7950's at 1175 core, 200 memory, stock voltage with 75% fan speed using the 12.8 drivers. They run at about 60C and are very stable doing 600 Mh/s a piece.

Do you use the same model as mine or a different one?
Do you have any idea how much power you draw by one card if you have a mem@200 and clock@1175?

[nwoolls]

Do you use the same model as mine or a different one?
Do you have any idea how much power you draw by one card if you have a mem@200 and clock@1175?

My cards are Sapphire 7950's. I'm not sure what a single card draws, but my whole system (2 7950's, 1 HDD, 1 Sempron CPU, 7 GB RAM, WiFi USB dongle) takes about 520W.

[nookiegirl]

Do you use the same model as mine or a different one?
Do you have any idea how much power you draw by one card if you have a mem@200 and clock@1175?

My cards are Sapphire 7950's. I'm not sure what a single card draws, but my whole system (2 7950's, 1 HDD, 1 Sempron CPU, 7 GB RAM, WiFi USB dongle) takes about 520W.

My normal rule of thumb is to use 150W for CPU, RAM, etc (if you don't run overclocked high end cpu)
So by that a single card would draw 185W... Sounds pretty nice