I'm not sure enforcing sse3 or later for AMD64 hardware is the best course of action. > egrep "^model name|^flags" /proc/cpuinfo model name : AMD Athlon(tm) 64 Processor 3000+ flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 syscall nx mmxext fxsr_opt lm 3dnowext 3dnow rep_good nopl eagerfpu pni lahf_lm 3dnowprefetch vmmcall This machine is still able to run Arch just fine, and has saved the day when the laptop I used day to day broke down. As others have said, AMD cpus might not have sse4 unless they are quite recent. Requiring sse2 might be a reasonable cutoff, but I'm sure there will be people still using older machines that will complain if sse2 is mandatory, as I can reasonably see late pentium 3 machines still being usable for office, email or light browsing applications. -- Mauro Santos
