In the docs: http://gcc.gnu.org/onlinedocs/gcc-3.4.3/gcc/i386-and-x86_002d64-Options.html#i386-and-x86_002d64-Options I read that there are 3 different -mtune/-march flags for the Pentium 4 CPU, but how do I figure out which one my CPU is? If its the "standard" pentium4, the improved prescott or the improved noacona? Med venlig hilsen/Best regards Søren Neigaard System Architect ................................ Mobilethink A/S Arosgaarden Åboulevarden 23, 4.sal DK - 8000 Århus C Telefon: +45 86207800 Direct: +45 86207810 Fax: +45 86207801 Email: s.neigaard@xxxxxxxxxxxxxx Web: www.mobilethink.dk ................................