amd64 slower than i386 on identical AMD 64 system?

[JoaoBR]

Hi
Since some time (>6.0R) I have the impression that amd64 runs slower than 
i386. Now I run some tests on identical hardware and using ubench confirmes 
this. Somebody has comments on this?

João



#####################################
Athlon64 3200+ (i386)
Ubench Single CPU:    97255 (0.48s)
Ubench Single MEM:   146557 (0.40s)
-----------------------------------
Ubench Single AVG:   121906
#####################################
Athlon64 3200+ (amd64)
Ubench Single CPU:    86200 (0.39s)
Ubench Single MEM:   106488 (0.41s)
-----------------------------------
Ubench Single AVG:    96344
#####################################

an athlon 3500 marks as an athlon 4000

#####################################
Athlon 64 3500+ (i386)
Ubench Single CPU:    94013 (0.38s)
Ubench Single MEM:   128801 (0.39s)
-----------------------------------
Ubench Single AVG:   111407
#####################################
Athlon64 4000+ (amd64)
Ubench Single CPU:   111604 (0.44s)
Ubench Single MEM:   113530 (0.39s)
-----------------------------------
Ubench Single AVG:   112567
#####################################










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