The
AMD Athlon 64 X2 Dual-Core processor contains two processing cores,
residing on one chip, which increases efficiency and speed while
running multiple programs and multi-threaded software. It enables a
seamless transition from 32-bit to 64-bit applications. Both 32- and
64-bit applications can run virtually simultaneously and transparently
on the same platform.

Dual-core refers to a CPU that includes two complete execution cores per physical processor.