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

Last response: in Graphics & Displays
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October 28, 2013 3:44:26 AM

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!
a c 132 K Overclocking
October 28, 2013 4:03:47 AM

Well have you increased your power slider?
Those number are decent for stock voltage.
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October 28, 2013 4:19:43 AM

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?
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a c 132 K Overclocking
October 28, 2013 4:30:09 AM

Core speed will help you a lot more than memory speed.

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October 28, 2013 4:42:53 AM

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.
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a c 132 K Overclocking
October 28, 2013 4:54:37 AM

No no. Other way around, you want the 1100 to go as high as possible BEFORE you OC the VRAM.
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October 28, 2013 11:59:57 AM

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.
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a c 132 K Overclocking
October 28, 2013 1:25:16 PM

Awesome to hear! :)  Now if you start voltage tweaking you could get even more.
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!