Author: Ricardo Gibert
Date: 23:50:07 01/20/02
Go up one level in this thread
On January 20, 2002 at 23:43:21, Vincent Diepeveen wrote: >On January 20, 2002 at 22:02:10, Terry McCracken wrote: > >>Can anyone explain how and why a P-IV at 1.7 Ghz with 512MB (PC800) RDRAM >>outperformed an Athlon running at 1.4 Ghz with 266Mgh DDR Bus and 256MB of SDRAM >>on a Fritzmark by a wide margin? > >fritz might be in p3 assembly and has probably nearly no mispredicted >branches somehow. further it is such a small program that it hardly >needs data cache. > >The 3 major disadvantages from the P4 are > a) HUGE branch misprediction penalty > b) very SMALL datacache > c) no way to do 4 instructions a second according to You must mean "4 instructions per clock". > experts who read the design, it can to at most 3 > instructions a second. > >>The Fritzmark for the Pentium was 749 and the AMD a mere 548! Why? This is >>contrary to the findings of this forum. That is a difference of 201, that is >>large! >> >>An explantion would be appreciated, thanks! >> >>Terry
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