M2 benchmarks

By: Dummond D. Slow (mental.delete@this.protozoa.us), June 17, 2022 7:35 am
Room: Moderated Discussions
Adrian (a.delete@this.acm.org) on June 17, 2022 3:34 am wrote:
> Dummond D. Slow (mental.delete@this.protozoa.us) on June 16, 2022 1:03 pm wrote:
> > Adrian (a.delete@this.acm.org) on June 16, 2022 11:43 am wrote:
> > >
> > > For single-thread GB5, the recorded clock frequency shall match the maximum turbo frequency
> > > of that CPU. If it was higher, the result must be excluded due to overclocking,
> >
> > Note that some processors have actual turbo clocks that are 50-150 MHz above the official
> > boost clock by design (stock, not overclocked), happens with most of the Ryzens. But AMD
> > also allows you to raise boost limits manually as a form of OC, so hard to tell.
> >
>
>
> I an well aware of that, because I have a Zen 3 with the nominal maximum turbo frequency
> of 4.8 GHz, but there are 2 cores which sometimes go up until 4.9 GHz.
>
> Above I had given a simplified explanation.
>
> You are right that a clock frequency higher than the nominal by 1% is not a reason for exclusion. However,
> most really overclocked computers are easily distinguished when looking at the complete GB5 results, because
> the clock frequencies differ by at least a few hundreds MHz from the nominal turbo frequency.
>
>

Well, those are the liquid nitrogen ones I guess. Processors overclocked under normal cooling aint going to be like that. You can assume it is OC if you see that both single thread and multithread tests ran at the same locked frequency (which would commonly be lower than actual single-thread boost maximum with Ryzen, often).

But in recent years, individual clocking of cores complicate this. AMD offers PBO overclocking where multithread performance is made higher by raising current and power limits and they also allow you to override the maximum turbo boost clock limit. And they even allow underclocking voltage curves to also raise performance within normal turbo boost clock control operation. Thsoe overclocks become hard to identify I guess.
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M2 benchmarks-2022/06/15 12:27 PM
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