OK, so I am talking with my friends about hardware and I'm a little lost with these confangled new processors. Namely the AMD Athlon and the Intel Duo.

The AMD Athlon 64 FX-60 (with HyperTransport and Dual Core Technology) and the Intel Core Duo Processor T2600 to be precise.

Now, from my understanding, isn't AMD putting two chips into one? Whereas Intel is using two physical chips?

Does this seriously affect performance that much, or is it not noticeable?

And price aside, which is "better" (irrelevant to company preference )?