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Problem with overclocking Sapphire HD7970 Dual X (voltage resetting)

post #1 of 7
10/7/12 at 2:26am
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I have a long running problem with overclocking my HD7970 that I have never been able to crack. I can get stable overclocks all day long. I've even tested this running higher voltage on stock clocks just to see if it will happen, and it does. Essentially, regardless of overclocking software I'm using, the voltage setting on my card will randomly reset back to stock with no warning or pattern. I've included a screenshot of Afterburner to show what I'm talking about (the "1.149" covers it a bit, but it dipped to stock until I put it back to 1.149). Obviously, thanks to the overclock, this crashes my display driver and boots me out of whatever I was doing. As I said, though, I can make this happen with only voltage change and no overclock. the voltage drop coincides with a sudden increase in GPU usage to 100%, as you can see from the Afterburner screen.

Any ideas?

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post #2 of 7
10/7/12 at 8:59am
my OC eddition does that too, randomly resets back to 1.175

My guess is the driver randomly checks the bios, and then sets it to wahts in there ignoreing software voltage bumps.
Edited by The Mac - 11/12/12 at 9:52pm
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post #3 of 7
11/10/12 at 9:56pm
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Problem I'm having is my Sapphire totally ignores AB's voltage that I set. I can throw it up to 1.3v but when I load up Heaven/any game the voltage doesn't even reach 1.2v, it sticks around stock 1.187v. It's annoying because this is really limiting my overclock. I may be having the same problem you are, perhaps the voltage IS increasing but it drops too fast for me to see it. This seems to be a driver problem.
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post #4 of 7
11/11/12 at 12:43am
1.3 is the target voltage, are you sure you are not looking at the measured voltage? (Vddc in gpu-z) They arent the same thing.
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post #5 of 7
11/11/12 at 12:48am
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Quote:
Originally Posted by Stealth Pyros View Post

Problem I'm having is my Sapphire totally ignores AB's voltage that I set. I can throw it up to 1.3v but when I load up Heaven/any game the voltage doesn't even reach 1.2v, it sticks around stock 1.187v. It's annoying because this is really limiting my overclock. I may be having the same problem you are, perhaps the voltage IS increasing but it drops too fast for me to see it. This seems to be a driver problem.

if you have a ghz edition card might try trixx or try checking force constant voltage in msi ab that has helped people befor that couldnt change volts.
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post #6 of 7
11/11/12 at 9:32am
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Quote:
Originally Posted by Bal3Wolf View Post

Quote:
Originally Posted by Stealth Pyros View Post

Problem I'm having is my Sapphire totally ignores AB's voltage that I set. I can throw it up to 1.3v but when I load up Heaven/any game the voltage doesn't even reach 1.2v, it sticks around stock 1.187v. It's annoying because this is really limiting my overclock. I may be having the same problem you are, perhaps the voltage IS increasing but it drops too fast for me to see it. This seems to be a driver problem.

if you have a ghz edition card might try trixx or try checking force constant voltage in msi ab that has helped people befor that couldnt change volts.

I've tried Trixx and it's crap IMO lol. I don't have a GHz edition, I have the OC with boost. I've managed to get up to 1150/1600 with Afterburner, core voltage set at 1193mv and memory voltage 1600mv. In game my voltage peaks at about 1.143v. I'm pretty happy where I am but will slowly raise it up and continue testing. Will try the "constant voltage" option but I've heard that's not a good idea?
Quote:
Originally Posted by The Mac View Post

1.3 is the target voltage, are you sure you are not looking at the measured voltage? (Vddc in gpu-z) They arent the same thing.

I modified a config file for Afterburner so it now reads real-time core voltage that matches GPUZ's readings.
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post #7 of 7
11/12/12 at 9:43pm
gpu-z is not target voltage, thats measured.

There is always vdroop, so it will never read the target voltage.

try aida64, it has both.

for me:

idle: target: 0.85v - Meassured 0.800
3D: target: 1.175v measured: 1.014
Edited by The Mac - 11/12/12 at 9:50pm
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