Zen 3 triple FMA units

By: Per Hesselgren (perhesselgren.delete@this.yahoo.se),
Room: Moderated Discussions
anon.1 (abc.delete@this.def.com) on October 31, 2020 8:06 am wrote:
> Adrian (a.delete@this.acm.org) on October 30, 2020 12:37 pm wrote:
> >
> > It appears that the rumors about Zen 3 having increased the
> > number of 256-bit FMA units from 2 to 3 have been true.
> >
> > The benchmarks that have begun to appear show floating-point
> > increases around 45% over Intel CFL/CML and Zen 2.
> >
> >
> > Also the number of integer AVX2 execution units must have been increased
> > because there are speed-ups over 40%, or even over 60%.
> >
> >
> > https://www.sisoftware.co.uk/2020/10/29/amd-ryzen3-5800x-review-benchmarks-cpu-8-core-16-thread-performance/
> >
> >
> >
>
> Are you just seeing the effect of an effectively larger cache
> or do you know that these benchmarks are 100% compute bound?

Now they only show 5950X
5950X on Sisoft

DGEMM should be more depending on cache but most of the others not
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Thread (7 posts)
TopicPosted ByPosted
Zen 3 triple FMA unitsAdrian
  So use AVX2 kernels and ignore AVX512 entirely? (NT)anonymous2
    So use AVX2 kernels and ignore AVX512 entirely?anon
    Good luck ignoring AVX512 with kernels that need scatter (NT)Heikki Kultala
  Zen 3 triple FMA unitsanon.1
    Zen 3 triple FMA unitsPer Hesselgren
    Zen 3 triple FMA unitsAdrian