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For our codes (numerical weather and climate models) the Intel compiler's P4 specific optimizations have a large benefit. Time per simulated day on Intel P4 processor Options Time (s) ifc -O2 319 Intel compiler ifc -O2 -tpp6 -xK 299 P3 specific options ifc -O2 -tpp7 -xW 213 P4 specific options Another model ifc -O2 667 ifc -O2 -tpp6 -xK 504 ifc -O2 -tpp7 -xW 452 Both these codes have a vector machine heritage and so don't make the best possible use of the processor cache. Martin Dix On Thu, 2004-01-22 at 09:27, Peter Shenkin wrote: I wonder if anyone out there has any experience they can share about specific P4 and/or Opteron optimizations of Linux x86 codes.