2009/9/25 Bob Arendt wrote:
My Athlon(tm) 64 X2 Dual Core Processor 3600+ (running x86_64) isn't
showing SSE3;  From /proc/cpuinfo

flags           : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca
cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt
rdtscp lm 3dnowext 3dnow rep_good extd_apicid pni cx16 lahf_lm cmp_legacy
svm extapic cr8_legacy 3dnowprefetch

Unless the 3dnow extensions are equivalent to SSE3, it looks like SSE2

is the least common denominator for the x86_64 cpus.

-Bob

You are wrong:  pni == SSE3 .