Author: Gian-Carlo Pascutto
Date: 02:30:57 08/07/03
Go up one level in this thread
>The Opteron was tested in SPEC. For their entire set of programs (also
>non-chess and hence non-bitboarders), the Opteron is clock for clock 55%
>faster than the Athlon XP.
...and it's 74% faster clock for clock than the P4.
For Crafty, the Opteron is 65% faster clock for clock than the Athlon XP.
It's 165% (!!) faster clock for clock than the Pentium 4.
(All from SPEC data)
Opteron v Athlon Opteron vs P4
SPEC 1.55 1.74
Crafty 1.65 2.65
Sjeng 1.70 2.05
Crafty gets 7% more speedup on the Opteron compared to the average program,
and Sjeng gets 10% more speedup compared to the average program.
Based on this, it looks to me like the speedups are much more due to the
improved architecture (more registers, insanely fast latency, better branch
prediction, larger caches) than the 32 bit vs 64 bit difference. Crafty
definetely has more 64 bit arithmethic than I do.
When running 32 bit software (or more precisely, software using the old 8
register instruction set), the Opteron is 42% and 65% faster than the Athlon
and P4 respectively.
This means that, even when running NOT optimized software, a 2.0Ghz Opteron
is _still_ FASTER THAN ANY ATHLON XP OR PENTIUM 4 ON THE MARKET.
--
GCP
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