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Overclocking ASUS 6950 DirectCU II 2GB : +20% power CCC ???

Discussion in 'Overclocking & Cooling' started by alexwelcome, Oct 25, 2011.

  1. alexwelcome New Member

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    Hello the team,

    i've recently bought an ASUS 6950 DirectCU II 2GB,
    and I try to overclock it, WITHOUT UNLOCKING the Shaders wich only gives 5% of performance more (too risky for so low).

    I use these two softwares :
    - Asus SmartDoctor (last version)
    - ATI Catalyst CCC AMD Overdrive panel (last version 24Oct2011)

    As i read here and there, i have to :
    1. enable AMD OVERDRIVE in CCC and push PowerControlSettings to +20%
    2. I did tests and I pushed overclocking to 900Mhz GPU and 1300MHz Memory, with CCC cursors and default voltage (1.1v).


    My question is simple : do i really have to addd +20% in CCC PowerControlSettings to stabilize overclocking ?
    Is it power in watts, or power in volts (I think watts, but not sure) ?
    And of course : when I increase in the PowerControlSettings to +20% in CCC, does it add some voltage as smart doctor could do, or only watts ?

    More of all : during the overclocking process, do you know how can I detect when my 6950 DirectCU II needs more voltage to work fine ? What are the signs that says "put some more voltage" ? Artifacts ? lags ? I do not know, and i do not want to do mistakes.

    If my 6950 DirectCU II 2GB is stable at 900Mhz GPUand 5200 MHZ RAM (1300MHZ in CCC)
    with no voltage increase (default to 1.10V), I think i do not have to use AsusSmart Doctor..but once again, I'm not sure : must i have to use SmartDoctor instead of CCC AMDpanel ?


    Sorry for my english...not my first language.


    Best regards,

    Alex




    I think i need expert answers.
     
  2. LordJummy

    LordJummy New Member

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    The +20% slider doesn't increase the voltage to the GPU, it just allows 20% more power draw to prevent the GPU core from down clocking under high loads.

    It just allows you to push the GPU further and draw more power than the standard specs.

    That voltage is quite low for 900MHz btw. You might want to run kombustor/furmark and make sure you're stable at those settings. Also with the power control (20% slider) you will want to keep it at 20% if you plan on doing high OC's, otherwise you will get huge performance dips and unstable clocks.
     
    alexwelcome says thanks.
  3. alexwelcome New Member

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    thank you for answering LordJummy,

    Do you know how much voltage increase does my card needs?
    Which method ?
    900mhz needs +1.15v ? 1.20 v ? 1.25 ? more ? How could I Know the voltage ?
     
  4. LordJummy

    LordJummy New Member

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    every card is different. you need to read an overclocking guide, as I don't have time to explain it all to you right now.

    good luck
     
  5. OneMoar

    OneMoar There is Always Moar

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    if you arnt getting arifacts or crashes you don't need more voltage
    MAXIUM voltage you should use UNLESS your gpu is water cooled is 1.2v
    make sure the the fan is set to ramp up to 100% if you use 1.2v
    TBH if you need more then 1.18v you should consider accepting a lower clock speed
    925mhz or so should be attainable at 1.18v
     

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