Author: Vincent Diepeveen
Date: 20:43:21 01/20/02
Go up one level in this thread
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
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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