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Thread: AMD HD 3870 x2 Overclocking Guide

  1. #1
    Xtreme Guru
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    AMD HD 3870 x2 Overclocking Guide

    Are you Fed up with :banana::banana::banana::banana::banana: clocks in CCC?

    FYI. you do not need 8 pin psu dongle to overclock. two 6 pin dongles will work.

    1. If you want to run fan at 100% download and install riva tuner 2.06 and do the following:

    x:\Program Files\Rivatuner 2.06\rivatuner.cfg

    Comparing files rivatuner_2.06.cfg and RIVATUNER_2.06_8800GTS_G92_3870X2_RV670.CFG

    ***** rivatuner_2.06.cfg
    G86 = 420h-42Fh
    G92 = 610h-61Fh

    ***** RIVATUNER_2.06_8800GTS_G92_3870X2_RV670.CFG
    G86 = 420h-42Fh
    G92 = 600h-60Fh,610h-61Fh

    *****

    ***** rivatuner_2.06.cfg
    RV630 = 9588h-9589h
    RV670 = 9500h-9501h,9505h,9507h

    ***** RIVATUNER_2.06_8800GTS_G92_3870X2_RV670.CFG
    RV630 = 9588h-9589h
    RV670 = 9500h-9501h,9505h,9507h,950Fh

    *****
    edit your rivatuner.cfg so it looks like the bottom entry, the important line is the rv670 one for you. Open notepad as Run as Administrator, open the rivatuner.cfg in x:\Program Files\Rivatuner 2.06, edit the RV670 line so it looks like this:
    RV670 = 9500h-9501h,9505h,9507h,950Fh

    save it close and restart riva tuner

    2. Download amd gpu clock tool here: http://www.nordichardware.com/skrive...kTool_v0.7.zip

    You will need to apply this patch to the root in AMD gpu tool before running the program. here: http://www.nordichardware.com/skrive...16/ToolLib.zip

    2. run AMD GPU clocktool, see on device - BN:3, DN:0 = GPU1 and BN:4, DN:0 = GPU2... BN:3, DN:0 = GPU1

    BN:3, DN:0 = GPU1 will show default clocks(825/900)


    3. select Bn4 core and type in your gpu and mem clocks and hit apply. then select the second Bn3 and do the same.

    Check your clocks by opening the thermal sensor tab and hit start. it will show current clocks for both gpu's and mem

    4. next try to max out each core ad mem by overclocking one slighty higher than the other core and running a benchmark like 3dmark 2006. if it fails then you will know which each core maxes out so you can get the optimal performance from the card. Do the same for the memory.


    Thanks to ZoLKoRn, Sampsa and T_M for their feedback.

  2. #2
    Registered User
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    Thankyou much apprciated
    SYST 1 Asus Maximus Formula - E8400 3.0...O/C 4.2 - Ocz Reaper DDR2 1150 mhz 2x1gig - 3870x2 850/950 - Ultra X3 1000 watt PSU - Medium Air Cooling

    SYST 2 Asus P5K Deluxe P35 - E6600 2.4...O/C 3.5 - Ocz Reaper DDR2 1150 mhz 4x1gig - 3870 O/C 850/900 - Ultra X3 1000 watt PSU - Extreme Air Cooling - Ultra Case

    SYST 3 Asus Comando 965 - Intel PD 830 3.0...O/C3.6 - OCZ Reaper DDR2 1066 mhz 2X1gig - HD2900 XT...O/C 900/950 - Silverstone 650 watt PSU - Medium Air Cooling - Enermax Case

  3. #3
    Banned
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    Oct 2006
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    Great advice, much appreciated...

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