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New kepler, Why does one card boost higher that the other?

post #1 of 25
Thread Starter 
In SLI one 680 runs at 1254MHz and the other at 1241MHz why is that, Is it because one GPU core needs more juice, is it ones just better than the other or it only uses what it needs to accomplish the task, bottle neck? I notice in some games they both run at 1241MHz....Someone please explain it to me biggrin.gif
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post #2 of 25
you probably have throttling issues due to the heat.

Kepler will throttle its GPU clocks when it hits a certain GPU heat threshold....from what i have seen its at 70* C

also games will use the top card better then the 2nd card in SLI scenarios so that is also something to focus on.
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post #3 of 25
Thread Starter 
Heat isn't a issue there water-cooled, kepler is totally different than Fermi.
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post #4 of 25
Every kepler gpu has a different boost clock, you'll need to add a few mhz to even them out if you want them to be the same.
 
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post #5 of 25
Thread Starter 
Yeah but why are they different?
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post #6 of 25
Quote:
Originally Posted by USFORCES View Post

Yeah but why are they different?

this little thing called the silicone lottery....
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post #7 of 25
Quote:
Originally Posted by USFORCES View Post

Yeah but why are they different?
That's just how they are. I have 2 ASUS reference 680's, both have 100% ASIC quality, both stay under 70C, but one always runs 13 mhz faster than the other. Only nVidia knows why all Kepler chips boost differently.
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post #8 of 25

Quote:
The second number is what NVIDIA calls the boost clock, and this one is far more nebulous, as it relates to the operation of GPU Boost itself. With GPU Boost NVIDIA does not have an explicit top clock; they’re letting chip quality play a significant role in GPU Boost. Because GPU Boost is based around power consumption and temperatures, higher quality GPUs that operate with lower power consumption can boost higher than lower quality GPUs with higher power consumption. In essence the quality of the chip determines its boost limit under normal circumstances.

Article at AnandTech explaining into detail.

Pretty much quality dictates an average(prob in a driver related algorithm); in reference to different voltage stepping/voltage/GPU temps.

thumb.gif
 
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post #9 of 25
Thread Starter 
I think I figured it out using GPUZ ASCI Quality. One card reads 98.1% and boost to 1241MHz the other 100% which boost to 1254MHz, So max boost is determined by the quality of the chip. thumb.gif

ASCI.jpg
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post #10 of 25
Quote:
Originally Posted by USFORCES View Post

Yeah but why are they different?

Because every single chip has different electrical properties.

ASIC quality seems to be roughly corresponding to leakage and may be part of the boost formula, but isn't the whole story.
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