News Asus Lists 4 Unannounced AMD Epyc CPUs: 8-64 Cores

Gillerer

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Sep 23, 2013
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Asus also mentions the Epyc 7F32. With a 3.7 GHz base clock, it will be the fastest eight-core processor in the Epyc 7002 Series product stack. The chip has a 180W TDP, but sadly the L3 cache remains at 128MB.
If you did any analysis at all, you'd realize that:
  • AMD enables cores symmetrically across all CCDs and CCXs
  • every CCX on the same CPU will have the same number (either 1, 2, 3 or 4 cores)
  • double that for: each CCD (=compute die) will have an even number of cores (2, 4, 6 or 8)
Then for L3 cache:
  • each CCD has 32MB L3 cache, split 2×16MB between the two CCXes
  • 256MB L3 cache parts therefore must have the full complement of 8 CCDs, while 128MB L3 parts can do with 4 CCDs
Conclusion:
  • a 8-core EPYC CPU can only utilize 4 CCDs, because both CCXes on each have to have 1 core enabled: 1 per CCX ⇒ 2 per CCD ⇒ 8 per 4 CCD
  • AMD can't produce a 256MB L3 8-core part with the current division of CCD into two CCXes
 
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