If you want to know all about the CPU(s) on your system, then check the /proc/cpuinfo file.
[root@localhost ~]# cat /proc/cpuinfo
This will give you the following output.
processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 3 model name : Pentium II (Klamath) stepping : 3 cpu MHz : 1729.327 cache size : 128 KB fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 2 wp : yes flags : fpu de pse tsc msr pae mce cx8 apic pge cmov pat mmx fxsr sse sse2 up pni bogomips : 3527.30 clflush size : 32
This file has important information about the CPU.