By: juanrga (nomail.delete@this.juanrga.com), April 10, 2021 7:58 am
Room: Moderated Discussions
Anon (no.delete@this.spam.com) on April 9, 2021 10:06 am wrote:
> juanrga (nomail.delete@this.juanrga.com) on April 9, 2021 3:44 am wrote:
> > Cortex A72 achieving 4.2GHz on 7HPC:
> >
> > https://fuse.wikichip.org/news/2446/tsmc-demonstrates-a-7nm-arm-based-chiplet-design-for-hpc/
>
> Thanks, very interesting, so:
> 1) 4 A72 cores and 6MB L3 taking 27.28mm², so high performance transistors does indeed are
> a lot less dense, all those claims about small high perf ARM cores are just bullshit;
> 2) 1.375V to reach 4.2GHz, Zen 3 reaches 4.9GHz at that voltage, and the last 200MHz
> needed 0.175 extra volts, no way for a CPU like M1 or N1 going much futher than 3GHz.
Zen3 uses a more mature process node. Zen2, which was released after the TSMC demo, achieves about 4.35GHz at 1.375V, which is about 4% higher frequency than the demoed A72.
M1 and N1 don't need to be clocked much higher than 3GHz. Zen3 needs to hit 4.9GHz to match the performance of an M1 at 3.2GHz. And the N1 at 3.3GHz in Ampere beats (integer) the Zen2 core in the EPYC 7742.
> juanrga (nomail.delete@this.juanrga.com) on April 9, 2021 3:44 am wrote:
> > Cortex A72 achieving 4.2GHz on 7HPC:
> >
> > https://fuse.wikichip.org/news/2446/tsmc-demonstrates-a-7nm-arm-based-chiplet-design-for-hpc/
>
> Thanks, very interesting, so:
> 1) 4 A72 cores and 6MB L3 taking 27.28mm², so high performance transistors does indeed are
> a lot less dense, all those claims about small high perf ARM cores are just bullshit;
> 2) 1.375V to reach 4.2GHz, Zen 3 reaches 4.9GHz at that voltage, and the last 200MHz
> needed 0.175 extra volts, no way for a CPU like M1 or N1 going much futher than 3GHz.
Zen3 uses a more mature process node. Zen2, which was released after the TSMC demo, achieves about 4.35GHz at 1.375V, which is about 4% higher frequency than the demoed A72.
M1 and N1 don't need to be clocked much higher than 3GHz. Zen3 needs to hit 4.9GHz to match the performance of an M1 at 3.2GHz. And the N1 at 3.3GHz in Ampere beats (integer) the Zen2 core in the EPYC 7742.
