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• Oliverda Topikgazda

  #53 2009-11-17 00:01:37

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  Oliverda

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  "I asked John on the 5% additional space yields 80% more improvement between two cores. When the original info on CTM estimation came out is was 50% yields 80%. I don't know if this was a mistype that was never corrected, or if he really meant Buldozer will compress effectively two cores into the space of one which I too myself am skeptical, but i have never heard this ~5 corrected either way.

  This would mean that AMD could fit two Bulldozer modules (4 cores) in the same space a Intel would require for three Nehalem cores or you could say that 4 bulldozer modules, (8 cores) would be the same size as a 6 core Nehalem processor.

  However here the information is old, but still relevant: [link]

  Nehalem
  Core Area - 97.6 mm2
  L2 Area - 7.1 mm2
  L3 Area - 45.6 mm2

  Shanghai
  Core Area - 61.2 mm2
  L2 Area - 15 mm2
  L3 Area - 45 mm2

  This is what I think John meant and probably stated the first time, but never restated; ~5% for %80% more performance is simply die wise compared to the Nehalem not the K10. Now it makes sense.

  Bulldozer core is ~105 mm2 (That's 2 Integer cores and 1 shared FP core) This makes sense because 2 10k cores are 61.2 => 122.4 in size, subtract one of the L2 caches => ~105 mm2

  So in effect performance density should be.
  Nehalem 125% / 97.6 mm2 > 1.28% per mm2
  Buldozer 180% / 105 mm2 > 1.71% per mm2
  or Bulldozer will be 33% faster per mm2 then Nehalem"

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