I was looking at my processor SPECS on my Ubuntu Linux 11.10 system.
Here is the end of the output of the command cat /proc/cpuinfo:
processor : 3 vendor_id : GenuineIntel cpu family : 6 model : 37 model name : Intel(R) Core(TM) i3 CPU M 330 @ 2.13GHz stepping : 2 cpu MHz : 933.000 cache size : 3072 KB physical id : 0 siblings : 4 core id : 2 cpu cores : 2 apicid : 5 initial apicid : 5 fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 11 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 rdtscp lm constant_tsc arch_perfmon pebs bts xtopology nonstop_tsc aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm sse4_1 sse4_2 popcnt lahf_lm arat dts tpr_shadow vnmi flexpriority ept vpid bogomips : 4256.47 clflush size : 64 cache_alignment : 64 address sizes : 36 bits physical, 48 bits virtual power management:
What I don't get are the lines marked:
model name : Intel(R) Core(TM) i3 CPU M 330 @ 2.13GHz cpu MHz : 933.000
The processor frequency here is 2.13 GHz on the first line and 933 Mhz on the second. Which is the correct one? Is the 2.13 GHz a refer to the sum of the frequencies of the cores?
Finally, which of these frequency tells me about the cycles per second / clock ticks per second taken by my system clock?
EDIT: In a small extension to Bruno Pereira's nice answer, I found that making a processor operate at different frequencies on the fly is also dynamic frequency scaling or cpu throttling. Here are two webpages which could be of interest: