Bus speed v Rated bus speed

Hi,
Could somebody please give me some advise on the information taken from my PC a moment ago - for instance, why the difference between the bus speeds - I often look at this info but haven't a clue what it really tells me with the exception of obvious, the temperature.
AMD Athlon II X3 440
Cores 3
Threads 3
Name AMD Athlon II X3 440
Code Name Rana
Package Socket AM3 (938)
Technology 45nm
Specification AMD Athlon II X3 440 Processor
Family F
Extended Family 10
Model 5
Extended Model 5
Stepping 3
Revision BL-C3
Instructions MMX (+), 3DNow! (+), SSE, SSE2, SSE3, SSE4A, AMD 64, NX, VMX
Virtualization Supported, Enabled
Hyperthreading Not supported
Fan Speed 1562 RPM
Bus Speed 201.3 MHz
Rated Bus Speed 2013.1 MHz
Stock Core Speed 3000 MHz
Stock Bus Speed 200 MHz
Average Temperature 68 °F
Caches
L1 Data Cache Size 3 x 64 KBytes
L1 Instructions Cache Size 3 x 64 KBytes
L2 Unified Cache Size 3 x 512 KBytes
Many thanks in advance ...
Mike