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Help for First OC AMD Radeon HD 7970 Sapphire Vapor-x

post #1 of 12
Thread Starter 
Hello!wink.gif

I need any HELP to try Overclock - for first time - my sapphire 7970 vapor-x.







post #2 of 12
You'll want to start with the core clock. Set the power target to maximum and your core to something like 1200MHz. Make sure your fan profile will allow the fan to reach a high enough RPM to keep the card cool while stress-testing.

Stress test with Unigine Heaven or MSI's Kombustor.

If you see artefacts (snow etc.) on your screen while stress-testing it means that it is unstable, and will likely crash during gaming sessions. To remedy this you can back down the core clock 10 or 20MHz. Rinse and repeat until you've reached the best clock possible whilst maintaining stability thumb.gif I would say that a higher core clock is more important than the memory clock, so once you've found your optimal core clock repeat the process with your memory, keeping the core clock at the maximum instead of reverting to stock.
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Nihilus
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post #3 of 12
Thread Starter 
Quote:
Originally Posted by JoshHunter View Post

You'll want to start with the core clock. Set the power target to maximum and your core to something like 1200MHz. Make sure your fan profile will allow the fan to reach a high enough RPM to keep the card cool while stress-testing.

Stress test with Unigine Heaven or MSI's Kombustor.

If you see artefacts (snow etc.) on your screen while stress-testing it means that it is unstable, and will likely crash during gaming sessions. To remedy this you can back down the core clock 10 or 20MHz. Rinse and repeat until you've reached the best clock possible whilst maintaining stability thumb.gif I would say that a higher core clock is more important than the memory clock, so once you've found your optimal core clock repeat the process with your memory, keeping the core clock at the maximum instead of reverting to stock.

Thank you JoshHunter

Look at the picture. I adjusted the parameters that you see listed with arrows: are correct?
The other parameters I need to change?

post #4 of 12
Thread Starter 
Ok...i try to set these values and i make a test with ungine heaven



Max temp during test= 59 °C

Test results:

post #5 of 12
Very nice! That is correct. Did you see any stuttering or weird artefacts on the screen during the run? If not, start playing a few games and see if it runs how you'd expect, maybe best not to play RPG's unless the game crashes before you get the chance to save thumb.gif

If your gaming session runs smoothly, why not bump the clock up a little more? Don't expect more than 1300MHz, most watercoolers won't even hit that.
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post #6 of 12
Thread Starter 
Step quietly benchmark ungine heaven .. ... But if I open Crysis 3 to play the game crashes. For example: even bringing the clock to 1200 as the beginning and leaving unchanged the other values ​​.... Crysis 3 goes into freeze.
Bringing the clock to 1150 game instead quietly.
post #7 of 12
Thread Starter 
Ok solved: i are stable with values on screen below:



Thank you JoshHunter....thumb.gif
post #8 of 12
Quote:
Originally Posted by flaubert View Post

Ok solved: i are stable with values on screen below:



Thank you JoshHunter....thumb.gif
Power Limit set to 0% and you still get 1200MHz?

Sounds too good? Have you verified that you card is not "throttling"?
Download GPU-Z, start it and let it run in the background. Start some game or benchmark, run it and look at the GPU-Z sensor tab.
The GPU Core and memory clock is the graph you want to look at. You can also look in Afterburner, GPU Core clock should show a stable frequency.


According to the pictures you have posted here, the highest GPU utilization i can see is 19%...
Edited by Falcy - 5/26/13 at 4:46pm
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post #9 of 12
watch the vrms temps. On my card they get hot frown.gif
They are at the bottom on the senors tab of gpu-z.
    
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CPUMotherboardGraphicsRAM
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Samsung 830 Corsair h60 Corsair af120 performance edition Windows 7 Home Premium 
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post #10 of 12
Thread Starter 
Quote:
Originally Posted by Falcy View Post

Power Limit set to 0% and you still get 1200MHz?

Sounds too good? Have you verified that you card is not "throttling"?
Download GPU-Z, start it and let it run in the background. Start some game or benchmark, run it and look at the GPU-Z sensor tab.
The GPU Core and memory clock is the graph you want to look at. You can also look in Afterburner, GPU Core clock should show a stable frequency.


According to the pictures you have posted here, the highest GPU utilization i can see is 19%...

-playing Crysis 3:



-During ungine heaven test



Max temp= 61°C
Edited by flaubert - 5/27/13 at 3:20am
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