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• #9722 S_x96x_S addikt Petykemano #9720

  Új Válasz 2024-08-07 20:16:10 #9722

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  S_x96x_S

  addikt

  válasz Petykemano #9720 üzenetére

  Az y-cruncher fejlesztője szerint:

  2 gyenge pontja van a Zen5-nek
  - memória sávszél
  - minimális avx512 adaptáció.

  A cikk aug14 után kiegészül .
  http://www.numberworld.org/blogs/2024_8_7_zen5_avx512_teardown/

  """
  The biggest achilles heel of Zen5 is the memory bandwidth and the limited adoption of AVX512 itself. There simply isn't enough memory bandwidth to feed such an overpowered vector unit. And the amount of people who use AVX512 is rounding error from zero - thus leaving the new capability largely unutilized.
  
  Memory bandwidth will not be easy to solve. We can expect Zen6 to improve things here with the new I/O and packaging improvments. But the bottleneck on AM5 and dual-channel DDR5 will remain. Perhaps a future platform with bigger caches (dual CCD X3D?) and 4-8 channels of CAMM memory will we see some light at the end of the tunnel.
  
  As far as the adoption of AVX512 itself. The reason why it's low right now is largely because of Intel's fumbles. You can't introduce a shiny new instruction set, stack a ton barriers to using it, and expect people to quickly adopt it. And by the time AMD was able to do their implementation, Intel had already given up and bailed out.
  
  So at no point in AVX512's history did both x86 CPU vendors support it at the same time. That sounds like a pretty big disincentive to developing for AVX512 right?
  
  With Zen5, AMD finally delivers what Intel could not. A quality AVX512 implementation that not only bring substantial performance gains, but also avoids all the negatives that plagued Intel's early implementations.
  
  Will that be enough to save AVX512? Will developers bite on that 2x performance? Only time will tell.
  
  In an ideal world, Intel will support AVX512 on all their CPUs even if they need to nerf it on some of chips the same way AMD has done with Strix Point. But as of today, Intel seems committed to killing off AVX512 for the consumer market. Thus they are playing a game of whether they can hold out long enough for AVX512 to die.
  
  However, Intel's ability to do this may be jeapardized by their recent (company-wide) problems which are almost certain to shed market share to AMD. And this does not bode well for trying to kill off AVX512. Regardless of what happens, I wish Intel luck. Competition is good for consumers.
  """

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