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Need help overclocking - Sapphire Radeon HD 7950 Dual-X

post #1 of 5
Thread Starter 
I want to overclock my GPU for the first time. I have looked on a youtube video: https://www.youtube.com/watch?v=gRC9rkq8Ta8 and decided to overclock the core speed of my GPU to 1100. After that I decided to do a benchmark test with 3DMark Vantage. When starting I somehow got this error: http://prntscr.com/35hj56 Does this mean that my system is not stable?
I tried to lower the core speed to 1050 and this time it worked. My GPU performance went better but my CPU performance only got lowered... Any idea why?

Edit: Using AMD FX-8320 Overclocked to 4GHz processor
post #2 of 5
Have you adjusted the voltage at all? Try using MSI Afterburner Beta 19 as seen here:

Download Link

After you have this downloaded and installed open up the settings (bottom right hand corner) and make sure the following are checked:

Unlock Voltage Control
Unlock Voltage Monitoring
Unlock Constant Voltage
Extend Official Overclocking Limits

Restart your PC.

When it loads back up you SHOULD be able to adjust your voltage (this is of course assuming your GPU supports voltage changes). Max SAFE voltage (as long as temps are ~70C or so which is GOOD) for your card is GENERALLY around 1.25v.

So go to about 1.2v and try 1100MHz and see how that goes. If it works stick with it...if not try upping it little by little til you get it right. Again though, make sure your temps are nice and good.

Don't want you frying your card!

Hope this helps! thumb.gif
post #3 of 5
Thread Starter 
Quote:
Originally Posted by AndroidVageta View Post

Have you adjusted the voltage at all? Try using MSI Afterburner Beta 19 as seen here:

Download Link

After you have this downloaded and installed open up the settings (bottom right hand corner) and make sure the following are checked:

Unlock Voltage Control
Unlock Voltage Monitoring
Unlock Constant Voltage
Extend Official Overclocking Limits

Restart your PC.

When it loads back up you SHOULD be able to adjust your voltage (this is of course assuming your GPU supports voltage changes). Max SAFE voltage (as long as temps are ~70C or so which is GOOD) for your card is GENERALLY around 1.25v.

So go to about 1.2v and try 1100MHz and see how that goes. If it works stick with it...if not try upping it little by little til you get it right. Again though, make sure your temps are nice and good.

Don't want you frying your card!

Hope this helps! thumb.gif

Thank you so much for replying and to try helping but I couldn't change my voltage. I did the steps exactly as you told them. Does this mean its impossible to change voltage on my card?
post #4 of 5
Yes...if you can not adjust the voltage in MSI Afterburner after doing what I instructed above then you can not adjust voltages...this is not uncommon though as many 7950's and 7970's have their voltages locked.

If it runs stable at 1050MHz then that's simply where it will have to stay unfortunately.

But hey, any speed boost is a nice speed boost!
post #5 of 5
Thread Starter 
Quote:
Originally Posted by AndroidVageta View Post

Yes...if you can not adjust the voltage in MSI Afterburner after doing what I instructed above then you can not adjust voltages...this is not uncommon though as many 7950's and 7970's have their voltages locked.

If it runs stable at 1050MHz then that's simply where it will have to stay unfortunately.

But hey, any speed boost is a nice speed boost!

Okay thank you so much for your help! biggrin.gif
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