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Intel Conroe, aka Intel Core 2 Duo is the newest and best line of dual-core processors currently out on the market. Like it's predecessor, the Core 2 Duo is a 65nm chip. Core 2 Duo's new architecture allows it to be efficient and fast. Here is a list of the models:

E6300=1.86Ghz

E6400=2.13Ghz

E6600=2.4Ghz

E6700=2.66Ghz

X6800=2.93Ghz

Pentium is the predecessor of Conroe made for consumer PCs.

Celeron is the budget processor made my Intel. It is mainly for people who their computers for internet surfing and watching movies.

Xeon is Intel's server processor.

65nm duel core, latest,fastest,coolest, but just a cpu like all the rest, only good if you need the latest,fastest,coolest,ect.