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Hello, Does someone have references or personal experience with scientific codes and the (relatively) new sse2 instructions on P4 and higher versus traditional FPU instructions? Tests on my codes indicate that using sse2 instead of fpu for my application caused a slowdown of about 50%. Obviously the wrong sign there. I will need more detailed study to see if this is related to the precision issue (my codes have a lot of precision tolerances which may need to be loosened up since calculations are going 80->64 bits), but I would appreciate any experiences, general guidelines, etc. Thanks, Aleksandar -- __________________________________ Aleksandar Donev Complex Materials Theory Group (http://cherrypit.princeton.edu/) Princeton Materials Institute & Program in Applied and Computational Mathematics @ Princeton University Address: 419 Bowen Hall, 70 Prospect Avenue Princeton University Princeton, NJ 08540-5211 E-mail: [log in to unmask] WWW: http://atom.princeton.edu/donev Phone: (609) 258-2775 Fax: (609) 258-6878 __________________________________