This is a type of multi-core technology which includes the two separate dual-core dies, where dial-core means a CPU
that includes two complete execution cores per physical processor),
installed together in one CPU package. In this set-up cores 1 and 2
would share a memory cache, as would cores 3 and 4. If core 1 or 2 needs
to communicate with 3 or 4, it is an external communication, usually
via the front side bus. Both Intel and AMD have introduced quad-core processors.
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