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Overclocking my EVGA GTX 680 FTW 4GB.

post #1 of 10
11/6/12 at 1:38pm
Thread Starter 
Alright, after mounting my Arctic Accelero Hybrid on the card my temps dropped an incredible amount, and I figured it was time to OC this little bastard and see what it can produce.

I use EVGA Precision X for the overclocking and Heaven DX11 Benchmark 3.0 / FurMark 1.10.3 / HWMonitor for monitoring the acctual performance and temperatures.

Right now Im running the card like this:

Power Target: 115%
GPU Clock Offset: +56
Mem Clock Offset: +496
Voltage: 1.175

Max Temp reached: 54C after 20 minutes of FurMark Burn-In (1080p / 8x MSAA).

Now it should be mentioned that I am a novice on overclocking so this is a very interesting experiment for me, and any advice you may have for me will be appreciated.

The memory clock probably shouldnt be pushed higher from what I have read, but I am wondering if it would be possible to step up the GPU clock offset much more, or if I should just leave it at +50-60.

Cheers smile.gif
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post #2 of 10
11/6/12 at 3:12pm
Keep pushing the GPU offset up. 54c max is an amazing load temp, so you probably won't run into any thermal walls.
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post #3 of 10
11/6/12 at 4:00pm
Thread Starter 
Quote:
Originally Posted by d-block View Post

Keep pushing the GPU offset up. 54c max is an amazing load temp, so you probably won't run into any thermal walls.

I was quite surprised aswell over the temps, but its all the Arctic Accelero Hybrid, it was a pain to mount it on the GPU but the cooling is just beastly.

Il do some more work on the GPU offset and see what I land on, cheers mate smile.gif

EDIT: Alright, tried pushing the clocks to:

GPU clock offset: +100
Mem clock offset: +500
Voltage: 1.175
Power Target: 120%

Results: 67C max during FurMark 15min Burn-In 1080p.

What suprised me however was that the GPU ran at 917-940mhz, wich is quite a bit lower then it goes for even with the default clock. So basically the card downclocked itself I guess, and I have no real idea why.

I then tried to set the clocks to:

GPU clock offset: +50
Mem clock offset: +400
Voltage: 1.175
Power Target: 115%

And the results were the same (Temps a bit lower though), even though the card now ran at just over 1000mhz it is still lower then at default clock. I must say I am confused about this as I am not an experienced overclocker.

So anyone holding the answer or atleast a possible answer, what is the reason for this? smile.gif

Cheers // Hukkie
Edited by Hukkie - 11/6/12 at 4:37pm
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post #4 of 10
11/7/12 at 3:45pm
When you report the GPU and memory speeds, use the actual speed instead of the offset - the boost clock is different for every card, so just providing the offset doesn't really tell us what the actual card speed is.

If the card is downclocking, it is either thermal throttling (unlikely) or power throttling. Do you have Afterburner up so you can see the clock speeds and GPU power use to see if the downclocks coincide with high power use? And I wouldn't use Furmark - it is a totally unrealistic load, it doesn't really provide any useful information except max temps (which don't matter since the load is unrealistic), and both AMD and Nvidia recommend against using it. I'm not sure if Nvidia is still throttling Furmark at the driver level like the used to, but it is better to just run some loops of Heaven instead.
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post #5 of 10
11/8/12 at 4:49am
Thread Starter 
Quote:
Originally Posted by Forceman View Post

When you report the GPU and memory speeds, use the actual speed instead of the offset - the boost clock is different for every card, so just providing the offset doesn't really tell us what the actual card speed is.
If the card is downclocking, it is either thermal throttling (unlikely) or power throttling. Do you have Afterburner up so you can see the clock speeds and GPU power use to see if the downclocks coincide with high power use? And I wouldn't use Furmark - it is a totally unrealistic load, it doesn't really provide any useful information except max temps (which don't matter since the load is unrealistic), and both AMD and Nvidia recommend against using it. I'm not sure if Nvidia is still throttling Furmark at the driver level like the used to, but it is better to just run some loops of Heaven instead.

I thought Afterburner was an MSI-exclusive program that only worked with their cards? If not, il give it a try and post my actual speeds and not just the offset.

Thanks for the help smile.gif
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post #6 of 10
11/8/12 at 2:34pm
Quote:
Originally Posted by Hukkie View Post

I thought Afterburner was an MSI-exclusive program that only worked with their cards? If not, il give it a try and post my actual speeds and not just the offset.
Thanks for the help smile.gif

No, Afterburner will work with any Nvidia card.
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post #7 of 10
1/18/13 at 12:51pm
I have the same card and am considering OC it as well. What is a safe max temp to look for when OC this card and also what is a safe voltage? I need to know what to look for when I run tests to monitor the temperature and voltage. Do I need to get some sort of special heatsink fan in order to OC a GPU? Or can I do it without one. I'm not looking for anything crazy, just a conservative OC would be nice.
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post #8 of 10
1/18/13 at 12:56pm
Quote:
Originally Posted by Hukkie View Post

I was quite surprised aswell over the temps, but its all the Arctic Accelero Hybrid, it was a pain to mount it on the GPU but the cooling is just beastly.

Il do some more work on the GPU offset and see what I land on, cheers mate smile.gif

EDIT: Alright, tried pushing the clocks to:

GPU clock offset: +100
Mem clock offset: +500
Voltage: 1.175
Power Target: 120%

Results: 67C max during FurMark 15min Burn-In 1080p.

What suprised me however was that the GPU ran at 917-940mhz, wich is quite a bit lower then it goes for even with the default clock. So basically the card downclocked itself I guess, and I have no real idea why.

I then tried to set the clocks to:

GPU clock offset: +50
Mem clock offset: +400
Voltage: 1.175
Power Target: 115%

And the results were the same (Temps a bit lower though), even though the card now ran at just over 1000mhz it is still lower then at default clock. I must say I am confused about this as I am not an experienced overclocker.

So anyone holding the answer or atleast a possible answer, what is the reason for this? smile.gif

Cheers // Hukkie

Not sure about 600 series, but the 500 series had built in protection to stop them drawing too much power in programs like Furmark, this might be why your clocks are lower, try running Heaven instead.
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post #9 of 10
1/18/13 at 2:41pm
Quote:
Originally Posted by shelly808 View Post

I have the same card and am considering OC it as well. What is a safe max temp to look for when OC this card and also what is a safe voltage? I need to know what to look for when I run tests to monitor the temperature and voltage. Do I need to get some sort of special heatsink fan in order to OC a GPU? Or can I do it without one. I'm not looking for anything crazy, just a conservative OC would be nice.

Overclocking them is easy. There is no voltage control on Kepler cards, so you don't need to worry about that. Install Afterburner or Precision, put the power limit all the way up, then increase the core and memory offsets while checking for stability with something like Heaven. Temps will take care of themselves, although you may want to make a custom fan profile to help keep them under 70 or 80 (where throttling occurs). I'd start with something like +50 core, +200 memory and go from there.
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post #10 of 10
1/21/13 at 4:33pm
This GPU Is very stubborn with the core clock.

I can get the mem clock +600 offset and 150+ core clock limit @ 1050v.

Is anyone else having this issue?
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