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Quick question about kepler boost.

post #1 of 8
Thread Starter 
Hello everyone how is it going biggrin.gif.
I have a Galaxy GTX 660 Ti GC 2 GB. The boost clock for this card as far as I googled is 1084 MHz, however my core clock boosts up to 1215 MHz and memory reaches 3005 MHz, is this normal or my card is overclocking beyond its safe limits?
If it's normal, I read it's possible to change something in the power limits of the card to make it boost higher giving more performance supposedly, if that's true how to do it and is it safe?
Thanks in advance biggrin.gif.
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post #2 of 8
Quote:
Originally Posted by Skorpian View Post

Hello everyone how is it going biggrin.gif.
I have a Galaxy GTX 660 Ti GC 2 GB. The boost clock for this card as far as I googled is 1084 MHz, however my core clock boosts up to 1215 MHz and memory reaches 3005 MHz, is this normal or my card is overclocking beyond its safe limits?
If it's normal, I read it's possible to change something in the power limits of the card to make it boost higher giving more performance supposedly, if that's true how to do it and is it safe?
Thanks in advance biggrin.gif.

Completely normal.

Boost and Kepler boost are different entities. The boost speed is a guaranteed boost from the factory. However, kepler boost takes it a step further and adjusts voltage along with clock speed based on the situation. As long as you keep your card below 70C, it should remain pretty close to the max kepler boost in high-usage situations.

Memory speed is stock. Nothing to worry about.

You can use MSI Afterburner or EVGA precision to change the power limits. Most cards can do 120% limit, but some cards do more (mine does 140%, and some cards have BIOS tweaks to allow higher.) Also, I recommend changing the fan curve to keep the GPU below 70C when overclocked. It's audible on my 660 Ti FTW Sig 2, but by keeping the card below 70C, I get max kepler boost in virtually every game I play.
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post #3 of 8
Thread Starter 
Max temp recorded for me was 74C, good enough?
Will setting a higher power limit allow for a higher boost? Or this is the maximum boost I can get?
EDIT : Lol, IDK what happened, this got posted 4 times for some reason, sorry.
Edited by Skorpian - 2/5/13 at 3:49pm
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post #4 of 8
Thread Starter 
Max temp recorded for me was 74C, good enough?
Will setting a higher power limit allow for a higher boost? Or this is the maximum boost I can get?
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post #5 of 8
Quote:
Originally Posted by Skorpian View Post

Max temp recorded for me was 74C, good enough?
Will setting a higher power limit allow for a higher boost? Or this is the maximum boost I can get?

No. setting the power limit higher will not allow boost to go higher. Rather, it will allow kepler boost to hold the clocks LONGER if the predetermined TDP is exceeded. That's the reason I ALWAYS set my power target to 140%; I don't have to worry about kepler boost being kicked down if a program uses the GPU in such a way that the TDP goes over 100% and the GPU core downclocks.
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post #6 of 8
Thread Starter 
Quote:
Originally Posted by Mad Pistol View Post

No. setting the power limit higher will not allow boost to go higher. Rather, it will allow kepler boost to hold the clocks LONGER if the predetermined TDP is exceeded. That's the reason I ALWAYS set my power target to 140%; I don't have to worry about kepler boost being kicked down if a program uses the GPU in such a way that the TDP goes over 100% and the GPU core downclocks.
What does power limit increasing do exactly? Does it increase the power going into the GPU? i.e, it's overvolting it? Does that mean higher temperatures and will require higher fan speeds with custom profiles?
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post #7 of 8
The card constantly monitors the amount of power it is using, relative to the "set" limit. Once the card approaches or exceeds that maximum power limit, the card will begin to throttle to bring total power use back under the limit.

Increasing the limit through Afterburner/Precision just lets the card keep running at the higher clockspeeds even after the 100% limit is reached, up to whatever the new limit is. It will increase temps, or more accurately it'll prevent throttling that would help to reduce them normally, but the card will also still temperature throttle at 70C and 80C even with the power limit increased. Increasing the power limit does not increase the voltage going to the GPU, although it may prevent the chip from throttling the voltage when it reaches the 100% power limit.

There is no real downside to maxing the power limit, except increasing total power used by the system (which could, I guess, have a detrimental effect on your PSU if it is not up to par). But it shouldn't negatively affect the card itself.
Edited by Forceman - 2/5/13 at 5:03pm
post #8 of 8
It is possible that your GPU boost clock will increase if you increase power limit, once you hit 100% power the card will throttle the boost clock/voltage to maintain that power target.
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