AMD's legendary K5, its first independently-designed processor, is being removed from the Linux kernel — 4.3-million-transistor chip gets the axe because it lacks Time Stamp Counter (TSC) support, making it a coding burden

Tom's Hardware: For The Hardcore PC Enthusiast [Unofficial] May 10, 2026

Source

AMD’s landmark K5 processor family will no longer be supported by Linux when kernel version 7.2 arrives.