Previously introduced as Mobile Athlon 64, Turion 64 is now the brand name AMD applies to its 64-bit low-power consumption (mobile) processors. The Turion 64 and Turion 64 X2 processors compete with Intel's mobile processors, initially the Pentium M and currently the Intel Core and Intel Core 2 processors. Earlier Turion 64 processors are compatible with AMD's Socket 754. The newer Richmond models are designed for AMD's Socket S1. They are equipped with 512 or 1024?KB of L2 cache, a 64-bit single channel on-die memory controller, and an 800?MHz HyperTransport bus. Battery saving features, like PowerNow!, are central to the marketing and usefulness of these CPUs.
Source[ Wikipedia ]