A non-existant line of Intel's microprocessors intended to succeed the Pentium 4 line of microprocessors.

Pentium 4 processors codenamed Prescott (the first 1MB L2 cache ones) were supposed to be named Pentium 5, but they kept using the Pentium 4 name instead.
Prescott line of processors were intended to be named Pentium 5.
by JayAlbie December 26, 2008
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