Adrian (a.delete@this.acm.org) on June 16, 2022 11:04 am wrote:
> Anon (Anon.delete@this.anon.com) on June 16, 2022 6:28 am wrote:
> > Adrian (a.delete@this.acm.org) on June 16, 2022 2:09 am wrote:
> > > Eric Fink (eric.delete@this.anon.com) on June 16, 2022 12:07 am wrote:
> > >
> > >
> > > > True enough for desktop, but M2 exceeds anything currently available in the laptop space.
> > > > It’s faster than top of the shelf Alder Lake P while being cheaper and using much less power.
> > > > In single core M2 is likely to be the fastest mobile CPU at the current time anyway.
> > >
> > >
> > > That is not true.
> > >
> > > Apple's own presentation of last week showed that the new M2 has only 87% of the single-thread
> > > performance of i7-1260P, which is not supposed to be the top of Alder Lake P (that
> > > would be i7-1280P, but it does not appear to be available anywhere).
> >
> > That chart was for multi thread not single thread.
> >
> >
>
> I have looked once more at the presentation, and I have found that I was wrong and you are right.
>
> Apple did not say what kind of performance was meant, but the end points in the performance
> comparison graph were at 14 W for M2 and 56 W for i7-1260P. These values are too large for a
> single-thread benchmark, so the results must have been indeed for a multi-thread benchmark.
>
>
> In this case, the results are actually worse for Apple than if the results had been for a single-thread
> benchmark, because in the power-limited condition the clock frequencies for Alder Lake are much lower than
> when they are limited by the maximum turbo values, and they are similar to the clock frequencies of M2.
> It is very likely that in a single-thread benchmark the advantage of Alder Lake P would be larger.
>
> According to the comparison graph, for most values of power consumption less
> than the nominal 28 W TDP, Alder Lake at equal performance with M2 consumes
> only a little more than the double of the power consumption of M2.
>
> At their nominal TDPs of 14 W for M2 and 28 W for i7-1260P, they both have a similar performance,
> but then doubling the power consumption of Alder Lake, to reach 4 times the power consumption
> of Apple M2, buys another about 15% of extra performance for Alder Lake P.
>
> It is true that i7-1260P has the advantage of 4 additional small cores. However, in
> the best case for the small cores, one can say that comparing i7-1260P (4+8) with M2
> (4+4) is somewhat equivalent to comparing 8 big Intel cores with 6 big Apple cores.
>
> From the Apple comparison graph it seems very likely that at equal clock frequencies 8 Intel cores have
> a similar performance with 6 Apple cores, which means about a 30% IPC advantage for Apple M2, which is
> consistent with the known IPC ratios between M1 and Tiger Lake and between Alder Lake and Tiger Lake.
>
>
I have no idea what you just said - seems to have no logic in it at all.
Eg. why would having more small cores in the intel processor not count in multithreaded especially when we know intels little cores are significantly faster than Apple’s