There are no mobile version of the X2's and FX's. If you see them in a laptop, they're usually just the desktop processors stuck inside, since those laptops are usually designed as desktop replacements.
The Intel Core Duo, or known as the Yonah core, is probably the best mobile processor in the market. Not sure which model, but it performs within the range of the Athlon X2 3800+ while using less power and producing less heat.

Awesome, huh?
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