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Boost clock gtx 670

post #1 of 6
Thread Starter 
Hey I got a qeustion thats probably simple but just wanted to know.

I just got a asus gtx 670 dc2(non top) and i have it overclocked with evga precision x.
I got the gpu clock offset at +120 and the mem clock offset at +500.

Now my question is since the default boost clock is 980mhz and i set +120 it should be at 1100mhz and thats what it says in gpu-z.
But when im stressing the gpu it goes to 1241mhz.

Is this normal or any other simple explanation?

grtz Peter
post #2 of 6
There are two clocks, basically. There is the base boost clock that the card is certified to go to (that's 980) and then there is the actual clock speed that specific card will go to (which varies by card). The overclock is applied to the actual clock, not the base boost clock, so if +120 gives you 1241, that means your card would actually go to 1121 at stock. GPU-z just reads the base boost clock, not the actual clock.
Edited by Forceman - 11/20/12 at 3:31pm
post #3 of 6
Thread Starter 
But why would my stock speed be 1121mhz when this card is supposed to be at 980mhz stock. It's the non top version.
I dont know much about this, but it just seems weird to me.
post #4 of 6
Quote:
Originally Posted by prince_of_peter View Post

But why would my stock speed be 1121mhz when this card is supposed to be at 980mhz stock. It's the non top version.
I dont know much about this, but it just seems weird to me.

The 980 is the "base" boost clock - it is the clock speed that the card is guaranteed to go to. But each card also has a actual boost clock which varies by card. The actual clock is based on the quality (basically) of the GPU itself, which is why it varies. As long as the card is under the power and temperature limits, it'll boost up to the actual clock speed - in your case that is 1121 - when left at stock. That's why people reporting thier offset when overclocking isn't much use, because the offset is added to the actual clock, not the base clock.

Different versions of cards have different base boost clocks (so the TOP version may be 1050 or something) but all that means is that the actual clock of those cards will be no lower than that value, they can always be higher. It's basically a way to maximize the performance of each card out of the box, a kind of auto-clocking where if the GPU on your card is better, then your actual clock speed will be higher.
Edited by Forceman - 11/21/12 at 2:18am
post #5 of 6
To make it simple for you

ASUS NON TOP, AFAIK is

Core Clock : 915 Mhz
Boost Clock : 980 Mhz

Kepler Boost = Varies...if you says is 1121 at stock....that means your Kepler Boost is 1121 - 980 = 141 Mhz.

so the 1121 is your BASE Kepler Boost ( shown in GPU Z as 980 Mhz ) + Kepler Boost ( 141 ) = 1121
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post #6 of 6
Thread Starter 
OK I understand now, Thanks!
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