It is not possible to provide a definitive answer to this question as it depends on the specific time frame and processors being referred to. However, as of now, the most accurate response would be "Intel Pentium 4" as it is an older chip that is not commonly found in today's PC processors.
To determine which one of the following is not a chip currently found in today's PC processors, we would need a list of options to compare against. Please provide the options so I can assist you further.
