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post #11 of 21
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So then I tried to play dragon age origins and see if I got any improvement in framerates, from the new overclock. And the game crashed and I got this error:

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post #12 of 21
Quote:
Originally Posted by PhotonFanatic View Post

So then I tried to play dragon age origins and see if I got any improvement in framerates, from the new overclock. And the game crashed and I got this error:


Yup, that means you need more voltage to make that clockspeed stable.


When I OC a GPU, I usually find the max stable clocks at stock voltage. Then I bump the voltage a tiny bit, and increase the core clock until it isn't stable anymore... and I repeat that process until I the GPU runs too hot or I run into the "voltage wall". And once I've done all that... I reduce the clockspeed by 50Mhz, just to make sure I'm stable in games.

Then I OC the memory separately (I usually don't touch voltage there, you probably shouldn't either unless you do alot of research), and reduce it by 25-50 Mhz once I found my "stable" clock.



As for a hardcore stress test, I recommend OCCT with error checking turned on.

http://www.ocbase.com/index.php/download


Alot of people say OCCT, Furmark and such are too extreme for cheap cards, but your 770 classy is built like a tank thumb.gif
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post #13 of 21
What is the max temp of this card anyway?
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post #14 of 21
Thread Starter 
Quote:
Originally Posted by brucethemoose View Post

Yup, that means you need more voltage to make that clockspeed stable.


When I OC a GPU, I usually find the max stable clocks at stock voltage. Then I bump the voltage a tiny bit, and increase the core clock until it isn't stable anymore... and I repeat that process until I the GPU runs too hot or I run into the "voltage wall". And once I've done all that... I reduce the clockspeed by 50Mhz, just to make sure I'm stable in games.

Then I OC the memory separately (I usually don't touch voltage there, you probably shouldn't either unless you do alot of research), and reduce it by 25-50 Mhz once I found my "stable" clock.



As for a hardcore stress test, I recommend OCCT with error checking turned on.

http://www.ocbase.com/index.php/download


Alot of people say OCCT, Furmark and such are too extreme for cheap cards, but your 770 classy is built like a tank thumb.gif


Thanks again for all the help. Its a big question mark for me, when it comes to the voltage. I see the voltage slider there on MSI afterburner, but I have no idea how much is safe to increase by. I know that you're watching the heat, but at what point is there too much heat? I was under the impression, that the card would shut down or go into some kind of self protect mode, when it got to hot. Just like a CPU will shut off. Is that the case? Or will these things just burn up?

Quote:
Originally Posted by Rebellion88 View Post

What is the max temp of this card anyway?

Are we talking about TDP here? I'm still learning exactly what TDP is. From what I can tell, its not necessarily your chip's complete max that you should avoid. Or is it? I used this video to study up on TDP:


https://www.youtube.com/watch?v=yDWO177BjZY
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post #15 of 21
Quote:
Originally Posted by PhotonFanatic View Post

Quote:
Originally Posted by brucethemoose View Post

Yup, that means you need more voltage to make that clockspeed stable.


When I OC a GPU, I usually find the max stable clocks at stock voltage. Then I bump the voltage a tiny bit, and increase the core clock until it isn't stable anymore... and I repeat that process until I the GPU runs too hot or I run into the "voltage wall". And once I've done all that... I reduce the clockspeed by 50Mhz, just to make sure I'm stable in games.

Then I OC the memory separately (I usually don't touch voltage there, you probably shouldn't either unless you do alot of research), and reduce it by 25-50 Mhz once I found my "stable" clock.



As for a hardcore stress test, I recommend OCCT with error checking turned on.

http://www.ocbase.com/index.php/download


Alot of people say OCCT, Furmark and such are too extreme for cheap cards, but your 770 classy is built like a tank thumb.gif


Thanks again for all the help. Its a big question mark for me, when it comes to the voltage. I see the voltage slider there on MSI afterburner, but I have no idea how much is safe to increase by. I know that you're watching the heat, but at what point is there too much heat? I was under the impression, that the card would shut down or go into some kind of self protect mode, when it got to hot. Just like a CPU will shut off. Is that the case? Or will these things just burn up?

Quote:
Originally Posted by Rebellion88 View Post

What is the max temp of this card anyway?

Are we talking about TDP here? I'm still learning exactly what TDP is. From what I can tell, its not necessarily your chip's complete max that you should avoid. Or is it? I used this video to study up on TDP:


https://www.youtube.com/watch?v=yDWO177BjZY

By temp we mean actual temperature. AFAIK, you want to stay below ~80C on the core, but some cards like the R9 290 or GTX 480 get hotter than that at stock speeds. I think GPUs will eventually shut down/throttle themself, but you definetly don't want to run them over 100C for a very long time.

TDP is how much power/electricity your card can actually consume. Nvidia put some weird power limits in place with the 770, but I don't know much about that.




770s have a driver-enforced max voltage of 1.175v, which is actually pretty conservative/safe AFAIK. Try voltages somewhere between that and stock voltage.
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post #16 of 21
Thread Starter 
Thanks! And now, more questions! If that's conservative on the voltage, what's the highest I should ever go? I get different places telling me different numbers. Some on this site have gone to 1.3v. Others say 1.2v is fine. A google search revealed that ASUS says not to go above 1200mv or 1.2v. And are we talking about idle, or what voltage its running at when I'm running furmark? Or is the voltage constant no matter what you're doing?

Also, I can remember back in the day in 2008, there was some dissatisfaction with how accurate temp monitors were, like Coretemp. That's been a long time ago, so I have no idea if that's true anymore. Is it still a problem? Is there a program that you would recommend that is known for its accuracy when it comes to GPU temps? Or has that been proven wrong, or overcome by now?

Furmark says my temp gets up to 79c on the burn in test. Would that indicate that I shouldn't increase the voltage at all? If in fact, 80c is the limit of this card. It seems that I'm quite heat limited here. If I increase the voltage and the clocks, the card is only going to get hotter.
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post #17 of 21
Thread Starter 
Another pic, is this the voltage the card is currently running at?

Capture-6.png
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post #18 of 21
Quote:
Originally Posted by PhotonFanatic View Post

Thanks! And now, more questions! If that's conservative on the voltage, what's the highest I should ever go? I get different places telling me different numbers. Some on this site have gone to 1.3v. Others say 1.2v is fine. A google search revealed that ASUS says not to go above 1200mv or 1.2v. And are we talking about idle, or what voltage its running at when I'm running furmark? Or is the voltage constant no matter what you're doing?

Also, I can remember back in the day in 2008, there was some dissatisfaction with how accurate temp monitors were, like Coretemp. That's been a long time ago, so I have no idea if that's true anymore. Is it still a problem? Is there a program that you would recommend that is known for its accuracy when it comes to GPU temps? Or has that been proven wrong, or overcome by now?

Furmark says my temp gets up to 79c on the burn in test. Would that indicate that I shouldn't increase the voltage at all? If in fact, 80c is the limit of this card. It seems that I'm quite heat limited here. If I increase the voltage and the clocks, the card is only going to get hotter.

Hmm, maybe I read the max voltage wrong... I know how to overclock a 7950, but not a 770! tongue.gif

IDK what a "safe" max voltage for a 770 is. I though all 770s (except the MSI Lightning and your EVGA Classified) had a hard limit, but I must've been confused... You should look through other threads, and know that your 770's VRMs (but not necessarily the core) can handle whatever voltage you set.

As for temps... I touched on it before, but the AMD R9 290 actually runs at 95C under load by design, and it's manufactured the same way your 770 is. 90C max in furmark sounds like a reasonable limit, as that translates to ~80C or less in actual games. Using MSI afterburner, you can change the fan curve so that the fans ramp up more aggressively, bringing temps down.


Programs can be inaccurate because they have to know what temperature sensor to look at. I recommend MSI Afterburner (because it's very popular/frequently updated) and HWInfo64 (because it just lists ALL the sensors it can find biggrin.gif).
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post #19 of 21
Thread Starter 
Well the problem is, since MSI afterburner doesn't actually show you what your voltage is at, I'm having a hard time being able to increase it. Unless that pic of GPUz I posted is showing the idle voltage? It looks like it is but I have to be sure, of course.
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post #20 of 21
Quote:
Originally Posted by PhotonFanatic View Post

Well the problem is, since MSI afterburner doesn't actually show you what your voltage is at, I'm having a hard time being able to increase it. Unless that pic of GPUz I posted is showing the idle voltage? It looks like it is but I have to be sure, of course.

There should be an option to graph the actual core voltage somewhere in the MSI AB options, but the voltage you set is generally what it goes to under load. I think OCCT shows voltage during the benchmark as well... I know it shows temps.

HWInfo64 is nice because it shows core/memory voltage, core/VRM/memory/memory VRM temps and current through various components, and other neat readings.
Edited by brucethemoose - 1/11/15 at 1:32am
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