CONFIG_POWER3 is not available for thedefaultarchitecture x86.
Result is shown for architecture powerpc
default or selected kernelversion does not have config value CONFIG_POWER3.
Result is shown for kernelversion 6.5.1

CONFIG_POWER3 (not configurable)

configname: CONFIG_POWER3

Linux Kernel Configuration
└─>Processor support
└─>POWER3
In linux kernel since version 2.6.15 (release Date: 2006-01-02)