Hi,
I am looking at purchasing a laptop in the near future. However looking at
Dell there appears to be two different types of processors, a "Mobile Intel
Pentium 4 Processor - M with Speedstep" and just an ordinary "Mobile Intel
Pentium Processor". For example, with the Inspiron 8500 and 5150.

The "-M" processors seem to be both more expensive and slower than the
ordinary ones. So what are the advantages/disadvantages of these
processors?

Why would I want to buy one instead of the normal processors?

Any advice/information would be much appreciated.

Luke