CPU / Processor
With CPU (central processing unit) is referred to the main processor of the device. Become particularly well known is this shortcut for the main processor on the motherboard of a computer.
In addition to current models also older than this, but rare CPU models are traded. This can be series or special model versions in limited circulation. But especially are prototypes such as the IDT 79R4000PC-50G 9223C Prototype by collectors in high demand: