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Title: Memory Tuning my new Gigabyte 7950 Post by: nookiegirl on May 15, 2013, 11:41:28 PM 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: http://i44.tinypic.com/dfagzm.jpg Title: Re: Memory Tuning my new Gigabyte 7950 Post by: middlemarkal on May 16, 2013, 12:13:05 AM For BTC lower it as much as you can, it will lower the temperature ;D
Title: Re: Memory Tuning my new Gigabyte 7950 Post by: nookiegirl on May 16, 2013, 12:46:51 AM Is there any ration I should keep between GPU clock, or could I just lower it to 150 Mhz and hit apply?
Title: Re: Memory Tuning my new Gigabyte 7950 Post by: spinx on May 16, 2013, 12:53:25 AM Have a look at my thread regarding this subject
https://bitcointalk.org/index.php?topic=204949.0 Title: Re: Memory Tuning my new Gigabyte 7950 Post by: nwoolls on May 16, 2013, 01:43:23 AM 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 (http://www.techpowerup.com/gpuz/) to see what your memory is actually running at while mining. If you want to underclock your memory, you'll need to use Afterburner (http://event.msi.com/vga/afterburner/download.htm) along with a few manual tweaks found in this thread (https://bitcointalk.org/index.php?topic=111891.0). 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. Title: Re: Memory Tuning my new Gigabyte 7950 Post by: nookiegirl on May 16, 2013, 11:00:30 AM 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 (http://www.techpowerup.com/gpuz/) to see what your memory is actually running at while mining. If you want to underclock your memory, you'll need to use Afterburner (http://event.msi.com/vga/afterburner/download.htm) along with a few manual tweaks found in this thread (https://bitcointalk.org/index.php?topic=111891.0). 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? Title: Re: Memory Tuning my new Gigabyte 7950 Post by: nwoolls on May 16, 2013, 11:27:38 AM Do you use the same model as mine or a different one? 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.Do you have any idea how much power you draw by one card if you have a mem@200 and clock@1175? Title: Re: Memory Tuning my new Gigabyte 7950 Post by: nookiegirl on May 16, 2013, 12:13:34 PM Do you use the same model as mine or a different one? 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.Do you have any idea how much power you draw by one card if you have a mem@200 and clock@1175? 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 |
