What does the 3 MB portion of the processor information mean?

Answer 1

This "3MB" is probably proceeded by "L2 cache" or "L3 cache" Or, its 3GHz.

If it is 3MB, then it is referring to the instruction-caching memory that is built right into the processor, a few small panels of extremely fast memory that temporarily store instructions for the processor. The including of cache greatly increased a processors overall performance. The L2 and L3 portion refer to levels of cache. L1 Cache is very small, typically two blocks of 32KB or 64Kb. This Cache is the fastest, used for branch prediction and direct instruction strings. L2 Cache is larger, typically 1MB or 2MB, and also a fair deal slower than L1 cache. L3 Cache is the slowest, and is shared by multiple cores (If there is more than 1) and is the largest cache, typically 3MB - 16MB, depending on the processor.

If it is actually 3GHz, then this is the number that reflects the number of Cycles Per Second, or Hertz, that the processor is capable of. 3Ghz is Three Giga-Hertz, or 3,000,000,000 Cycles per Second. Amazing isn't it?