Status: IN
RHEL 9 requires x86-64-v2 as the minimum x86_64 microarchitecture level, meaning CPUs without SSE4.2 and POPCNT (roughly pre-2009 AMD, pre-2008 Intel) are not supported.
Source: repo:entries/2026/03/04/en-documentation-red_hat_enterprise_linux-9-html-95_release_notes-architectures.md