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  • Petykemano

    veterán

    FWIW, Charlie from SemiAccurate had some musings on Bergamo about a month ago (not even sure how reputable this info is), but I'll summarize it as follows:
    - Bergamo takes same IOD as Genoa, but puts 8 Bergamo CCDs instead of Genoa's 12.
    - Each Bergamo CCD has (16) Zen 4c cores but the same 32 MB of L3 as Genoa's CCD.
    - Zen 4c CCDs splits up the (16) Zen 4c cores into two CCXs, and each CCX shares half of the total L3 (i.e. 2 MB of L3 per Zen 4c).
    - Given that there's two CCXs on each Bergamo CCD, it is likely that there is a latency penalty when a core on one CCX needs to access another core's data on a different CCX, even if that CCX is on the same CCD.
    - AMD likely has figured out how to connect (12) memory channels to (8) CCDs given that Milan already handles this situation fine.
    - Twice the socket performance of top Milan for all key foundational workloads.
    - Bergamo can run in non-SMT mode, which helps with per-thread performance. On a thread vs thread basis, 128C/128T Bergamo is about 60% more performant than 64C/128T Milan.
    Edit: If anyone has an issue with me summarizing this info because it technically was behind a paywall, let me know and I can delete it from this thread.

    [link]

    Persze nem tudjuk, hogy az info valóban Charlie-tól ered-e, hisz ezt bárki mondhassa,
    és azt se, hogy ha igen, akkor Charlie valóban jól informált volt-e.

    Mindenesetre ez alapján egy konzervatívabb megközelítés bontakozik ki, mint amit a WCCF leközölt.

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