Is ther any differance between "dual core" and a "core duo2" other than ones is for mobile and the othere desktops? I hear "dual core" used so much and now i've heard of a "quad core" yesterday!?!? Is there two types of dual copre for desktops? And i can figure out what quad core is.I was going to buy a dual core dell (yeah i know,don't say it lol) but i seen some with only a 2.3-2.6 dual core but on ebay i see some that are 3.4 -3.8. and how much better is a 1.6 -2.0 dual over a 3.6 HT? REAL BIG differance or what? Sorry if i ask to much.