Cores and Clock Speeds

• Pentium Mobile processors may have one or two cores; i5 Mobile processors all have two cores. The two cores can process instructions and execute functions as if they were multiple processors. Multiple cores therefore increase the overall speed and efficiency of the computer system. The cores of the i5 Mobile processors have clock speeds of 1.06 gigahertz to 2.66 gigahertz. The Pentium Mobile processors core clock speeds ranging from 900 megahertz to 3.46 gigahertz.
  
  

Cache Memory

• Cache memory is very fast memory built into the processor that is used to store instructions that are used frequently by the system. Cache memory helps free the system memory for other applications. Pentium Mobile processors have on-board cache memory ranging from 512 kilobytes to 3 megabytes. The i5 Mobile processors each have a 3 megabyte cache memory.
  
  

Bus Speed

• The front-side bus, or FSB, is the primary connection from the processor to the system memory. The speed of the FSB determines the maximum speed of the system's memory, or RAM. The Pentium Mobile processors have FSB speeds ranging from 400 to 800 megahertz. The i5 Mobile processors can support memory speeds of 800 to 1,066 megahertz.
  
  

Graphics

• The i5 Mobile processors have integrated graphics. Very few of the Pentium Mobile processors have graphics integrated, which means that computers with these processors require additional graphics processors or video cards to power their graphics.
  
  

Max TDP

• The maximum thermal design point, or max TDP, is the greatest amount of power used by the processor under typical operation. The Pentium Mobile processors have max TDP ranging from 5 watts to 88 watts. The i5 Mobile processors have max TDP ranging from 17 watts to 35 watts.
  
  

Cost

• The cost of the Pentium Mobile processors range from $178.00 to $272.00. The i5 Mobile processors range in price from $225.00 to $266.00.