Overclocking the HD3870X2

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All right… so a few weeks have passed and the most asked question for HD 3870X2 owners is: "How do you overclock the card?" or "How can I set the fan speed". Well, after reading a review of the HD 3870X2, I stumbled across something.

For starters, do note that the ATI Catalyst Control Center does not display the "ATI Overdrive" tab if you don’t use a 6 pin and 8 pin PCIe adapter.

Now that that’s out of the way, I’ll go over how to enable the fan speed control.

  • First: Download RivaTuner 2.06. RivaTuner v2.06 download from Guru3D.com
  • Second: Install RivaTuner 206.
  • Third: After you install RivaTuner, go the the file location (Default: C:\Program Files (x86)\RivaTuner v2.06 (64-bit OS users) or C:\Program Files\RivaTuner v2.06 (32-bit OS users) and open up RivaTuner.cfg with Notepad
  • Fourth: Add "950Fh" to the RV670 line of the configuration file.

Now you should be able to modify the fan controls!

As you can see, it’s working. Notice how cool the GPU is now!

Now, to overclock the GPU! (This is assuming you already have RivaTuner 2.06 installed)

  • First: Run RivaTuner
  • Second: Select Low-level system settings
  • Third: On the "Overclocking" Tab, check "Enable low-level hardware overclocking"
  • Fourth: Use ATI Tool to scan for artifacts (Can be downloaded from ATi Tool 0.27 b2 download from Guru3D.com)

Note: If you go past 878 MHz on the Core and 955 MHz on the Memory, ATI Overdrive will be disabled! Also, overclocking the card through RivaTuner will disable ATI’s 2D clock. As in, the GPU core will not downclock back to 300 MHz when idle.

Successfully overclocked to 891 MHz on Core and 999 MHz on Memory!

Will overclock the rest of the system and run 3DMark06 as soon as my power supply comes back. I’m running my setup now on an Antec TruePower 2.0 480 WATT rated with 33A max load on the 12V rail!

P.S. Fan is set to 52% throttle.

UPDATE!: AMDGPU Tool is needed to overclock BOTH cores on the HD 3870X2. This will be added to this guide within the next few days (when I get a chance). Thanks goes out to Tark!

3/31/08 UPDATE!:
1. First, download AMD GPU Tool (located and attached to the bottom of this post for file).
2. Extract the file to your desired location.
3. Then, downloadthe updated ToolLib.dll file needed to overclock both cores of the HD 3870X2 (also located and attached to the bottom of this post)
4. Place the new ToolLib.dll file into the AMD GPU Tool folder and select "Yes" when Windows asks you if you want to replace the file.
5. Here, you can set both GPU and Memory Cores. Disregard the "test fail" when setting your overclocks and fire up ATI Tool. You’ll see the new GPU and Memory Frequencies. I believe, but could be wrong, that the frequencies that are displayed are divided by 2, and therefore, look lower than what they are. So, for instance, if you overclocked the HD 3870X2 core to 950 MHz and the memory to 1000 MHz, ATITool will show the Core Frequency as 425 MHz and the memory frequency as 500 MHz. Use "Scan for Artifacts" to verify that your overclock was successful.

Discuss and ask questions here.




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