I just noticed that my Dual core mobile AMD ZM-82 is only showing one processor in /proc/cpuinfo and not two. Is there a reason? I am running centos 5.2 x86_64. uname -a Linux demobox.msgnet.com 2.6.18-92.el5 #1 SMP Tue Jun 10 18:51:06 EDT 2008 x86_64 x86_64 x86_64 GNU/Linux Jerry -------------- more /proc/cpuinfo processor : 0 vendor_id : AuthenticAMD cpu family : 17 model : 3 model name : AMD Turion(tm) X2 Ultra Dual-Core Mobile ZM-82 stepping : 1 cpu MHz : 600.000 cache size : 1024 KB physical id : 0 siblings : 1 core id : 0 cpu cores : 1 fpu : yes fpu_exception : yes cpuid level : 1 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt rdtscp lm 3dnowext 3dn ow constant_tsc up pni cx16 lahf_lm cmp_legacy svm extapic cr8_legacy misalignsse 3dnowprefetch bogomips : 4393.73 TLB size : 1024 4K pages clflush size : 64 cache_alignment : 64 address sizes : 40 bits physical, 48 bits virtual power management: ts ttp tm stc 100mhzsteps hwpstate [8]