"Invisible" overclock on a GTX 970

[HP2]

Hi!

I have a small issue on my Asus GTX970 Strix.
I'm using the GPU Tweak utility and set the profile to "gaming". Here is the settings according to the sliders:
GPU boost clock: 1253 MHz
Memory clock: 7010 MHz
Max voltage: 1175 mV

But when I launch a game, the GPU clock goes up to 1291 MHz and voltage to 1200 mV (memory is ok). So I have a 38 MHz and 25 mV more than what it should be. And it happens also when I overclock; always a 38 MHz and 25 mV more than the sliders.

The same happens with Afterburner.

Not really a serious problem, but I'm just curious to know why this is happening 

Thanks! 

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[DaveLembke]

Might be an offset bug that no one else has picked up on. Have you contacted nvidia on this to see if they have any info on this offset?

[HP2]

I'll contact Asus tomorrow and I'll keep you posted!

[Calum]

It's also possible that your GPU is just boosting a little higher because it has the headroom to do so, boost clocks aren't totally fixed so some variance is normal.
What's the highest clock you've seen at stock settings without touching any utilities to change speed etc?

[HP2]

It's also possible that your GPU is just boosting a little higher because it has the headroom to do so, boost clocks aren't totally fixed so some variance is normal.
What's the highest clock you've seen at stock settings without touching any utilities to change speed etc?

That could explain everything!
Highest clock is 1291 MHz and highest core voltage is 1.2v

[Calum]

It may be worth just double-checking the readings with GPU-Z as I've seen Afterburner and programs based on this like EVGA and Asus' own utilities read a little wonky at times - normally just a few MHz higher for no obvious reason, which could explain this.  If GPU-Z reads as "stock" and the variance between this and Afterburner/GPU Tweak is always the same, then you know this is what's happening.

[HP2]

GPU-Z and HWINFO read both 1291MHz and 1.2v
Am I the only one who experience this offset?

[HP2]

It's also possible that your GPU is just boosting a little higher because it has the headroom to do so

Got reply from ASUS. You were right! Here is their answer:

This is not an issue, it depends on the usage and the temperature of the card.

Now we know