I've only ever used Pentium for any of my desktop computers and one laptop i've owned and I have no idea what the difference is or how to compare while shopping. I'll be heading over seas just after Christmas and I was looking around today and thought it'd be a good idea to ask if anyone could help me sort that out. So my question is: does anyone know the difference between these two and possibly which would be better for a laptop? How do the processor speeds compare? I notice that some may say it's like 3.07 Ghz, yet a more expensive different processor will only be 1.67 Ghz or something. Why are they different (smaller?) yet so much more expensive? Thanks in advance.