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Overclocking Gigabyte 7970 at stock voltage.

post #1 of 14
Thread Starter 
Hello,

I have 2 x Gigabyte 7970s in Crossfire. The voltage is locked and the GPU Clock is at 1000 and the Memory Clock is at 1375. I was wondering if I can overclock them to 1050-1100 GPU Clock on stock voltage and what exactly I would have to do the try it out.

Thank you in advance for any and all help.

Testudo
post #2 of 14
max out power control to +20%. test with benchmarks like 3d mark 2013, unigine heaven 4.0, unigine valley 1.0 . start with 1025 mhz and push in 25 mhz steps . 1100 mhz should be easy to achieve at stock voltage. you could even run at 1150 - 1200 mhz but it all depends on your luck and the quality of the chip. once you have got max stable clocks then test with games like bf3, crysis 3, farcry 3. if need be you might have to reduce 25 - 50 mhz to run stable in all games 24 x 7.
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post #3 of 14
when i had this to cards a few months ago with locked voltage, i pushed them to 1050 and 1425 all stock voltage, with MSI afterburner, but i recommend u start little by little and like raghu78 said dont forget to move up the power target to 20 wich is max good luck.
post #4 of 14
Thread Starter 
Thank you for your responses. I really appreciate it.

Is it worth the overclock? I mean, is there a significant performance difference? I have no overclocked a GPU before, so I am a little confused on exactly what to do. I am using Sapphire Tirxx for fan control, but I know I could use that for the overclock. Here is what it looks like:


So, I can push where it says GPU Clock 25 MHz at a time, but what about the Memory Clock? The VDDC is locked, so I cannot do anything with that.
Will the temperatures shoot up at all and is there a danger of damaging my cards? Oh, I guess that is another thing: I would have to OC both cards, correct?

There answer may be apparent, so thanks for putting up with and helping a noob lol.

Testudo
post #5 of 14
Overclocking should give you higher framerates indeed. Whether it's worth it or not is probably up to you.
Sorry I don't know what you mean by " VDDC is locked ", but if you mean that you can't push memory clock further it's not really a problem since you'll benefit most from core clock overclocking since the 7970 already has a pretty big memory bandwith.
There is always a danger but keep your card temperature under 75C ( or under 70C preferably ) and VRM temperatures under 90C and you should be fine.
Yes you need to overclock both cards, if one card has higher clocks than the other it'll downclock to match the slower card.
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post #6 of 14
Thread Starter 
Quote:
Originally Posted by Skorpian View Post

Overclocking should give you higher framerates indeed. Whether it's worth it or not is probably up to you.
Sorry I don't know what you mean by " VDDC is locked ", but if you mean that you can't push memory clock further it's not really a problem since you'll benefit most from core clock overclocking since the 7970 already has a pretty big memory bandwith.
There is always a danger but keep your card temperature under 75C ( or under 70C preferably ) and VRM temperatures under 90C and you should be fine.
Yes you need to overclock both cards, if one card has higher clocks than the other it'll downclock to match the slower card.

Thanks for the response. I believe the VDDC is the voltage. You can see it in the image that I posted in the previous post.
post #7 of 14
If you can't overvolt your card then probably your card is one of the voltage locked ones. Did you try MSI Afterburner? Some people say it's better for overclocking. Not sure myself.
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post #8 of 14
Thread Starter 
Quote:
Originally Posted by Skorpian View Post

If you can't overvolt your card then probably your card is one of the voltage locked ones. Did you try MSI Afterburner? Some people say it's better for overclocking. Not sure myself.

Oh yeah, I am sure it is voltage locked. I am trying to get the highest, most stable overclock that I can with the stock voltage, as seen the in image I posted in 4th post. That is a screenshot of my desktop with Sapphire Trixx.
post #9 of 14
yeah the recent versions of Gigabyte HD 7970 are voltage locked.
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post #10 of 14
Then try sliding the core clock 25 MHz at a time, keeping card temp lower than 75C and VRM temps lower than 90C until you reach the most stable clocks. Focus on core clock first. After finding the stable one ( usually done by unigine heaven and 3dmark ) try some real life gaming for as long as u can. Some people find their overclocks stable in unigine heaven and 3dmark and so, but in real life it's not stable. So you have to test for real-life stability as well.
Edited by Skorpian - 4/3/13 at 7:23am
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