Should the current Linux kernel be able to detect SSE3? A cat /proc/cpuinfo doesn't show it: processor : 3 vendor_id : GenuineIntel cpu family : 15 model : 4 model name : Intel(R) Xeon(TM) CPU 2.80GHz stepping : 1 cpu MHz : 2801.574 cache size : 1024 KB physical id : 3 siblings : 2 fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 5 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm pni monitor ds_cpl cid xtpr bogomips : 5586.94 It should probably not matter atm, no program is really using (that a know of). This is with FC3s 2.6.10-737smp. Jurgen --