g03c 64bits vs 32 bits for opteron/athlon 64



 Dear CCLers,
 we would like to buy a new computer for use with G03/linux.
 
have you got few benchs time results of g03revC. test files ( test397 is fine)
 with 1/ g03 64bits compiled for opteron  (or/and  athlon 64)
 
2/ g03 32 bits (compiled for pentium 4) on the same opteron (or/and athlon 64)
 does the 64bits compilation vs 32 bits improve performances ?
 
does the new intel xeon with EM 64 perform better than P4 (1MB in L2) with G03 32 bits program ?
 thanks for your help.
 sincerely yours
 Bertrand
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 ______________________________________________________________________
 Bertrand ILLIEN
 Laboratoire de Spectrochimie et Modilisation
 EA 1149 - FR CNRS 2465
 Faculti des Sciences et Techniques
 2, rue de la Houssinihre BP 92208
 44322 Nantes Cedex 3 FRANCE
 Tel :(+33)(0)2 51 12 55 65 - Fax : 55 67
 http://www.sciences.univ-nantes.fr/spectro