Author: Bo Persson
Date: 10:31:37 12/09/00
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On December 08, 2000 at 16:17:15, Bertil Eklund wrote: >On December 08, 2000 at 14:36:53, Jeroen van Dorp wrote: > >>On December 08, 2000 at 14:06:25, John Dahlem wrote: >> >>>is the p4 already out? I saw yesterday on the Dell site that they were selling >>>p4 1.5 GHz computers, and so was gateway. Are these just preorder or something? >> >>No, they're on the market since a week and a half or so. >>The first testing already showed not that much difference on speed, especially >>for gamers, against thunderbirds and PIII's. >> >>Don't know about chess programs though. >> >>Jeroen ;-} > >Hi! > >For todays chess-programs it seems to compare with Athlons or P3s with half the >speed. A P4-1,4 is about egual to a P3 or Athlon of 700mhz. > Yes, but his could change quickly for newer programs. Look at Tom's Hardware for his P4 - Final Recount where he reports about Intel Engineers getting the P4 performance from half the speed to about twice the speed of a PIII in some graphics applications. Their main trick was to recompile with Intel's new P4 optimizing compiler! The tweeking of a program might follow the pattern: - get some ideas - try one out - no improvement - skip it! - try another - 4% faster - keep it! After doing that for a while, your program is highly tuned to your own hardware/compiler combination. We have seen this happen for the bit scanning instructions BSF/BSR which were introduced as very fast for the 386/486 generation, but were terribly (terribly!!) slow for Pentium/Pentium MMX. On a PII/PIII they are now ligthning fast again. Just wait until some of the developers get their hands on a P4! >Bertil Bo Persson bop@malmo.mail.telia.com
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