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Best overclock for Sapphire HD 7950 OC Vapor-x boost?

Is there anyone out there that has experience with overclocking the Sapphire HD 7950 OC Vapor-x Boost graphics card? I have been playing around with a crossfire setup and managed to get 1100mhz on the core and 1300mhz on the memory without tweaking with the voltage of power supply settings. I have no clou if these settings are the best (max) possible settings for overclocking on stock voltage. Your advise is more than welcome!
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  1. Well have you increased your power slider?
    Those number are decent for stock voltage.
  2. Novuake said:
    Well have you increased your power slider?
    Those number are decent for stock voltage.



    I have not done that yet. I will try this today to see what effect is has. I have already read that adjusting the power slider in CCC to +20% the Sapphire can be boosted to a stable 1100/1450 or 1050/1575. That raises the following question. What is the better config? 1100 on the core or a higher memory speed?
  3. Core speed will help you a lot more than memory speed.
  4. Novuake said:
    Core speed will help you a lot more than memory speed.



    Tnx so far. I wil try the 1100/1450 setting first then. I will post my findings later today.
  5. Best answer
    No no. Other way around, you want the 1100 to go as high as possible BEFORE you OC the VRAM.
  6. Novuake said:
    No no. Other way around, you want the 1100 to go as high as possible BEFORE you OC the VRAM.


    OK, this is what i have doen today. I started my oc with 1100 on the core and stock speed on the memory, which is 1250, and +20% power (tanx for the tip). I ran 3d Mark 11. The highest stable oc of the core was 1170, but the highest x-score on 3D Mark 11 was with 1150. After determining the best oc on the core i started the oc on the memory. Strangely the higher i went on the memory the worst my x-score became. So decided to let the memory run at 1250.

    Then i started up battlefield 3 with 1150/1250. This resulted in 70-110 gps on ultra, 1920x1080, 120hz. While playing i raised the memory clock to 1350 and the system appeares to be stable. I run a crossfire setup and now my framerate is between 90-130, which is the best fps i have had so far on this rig.
  7. Awesome to hear! :) Now if you start voltage tweaking you could get even more.
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