Leaker Claims AMD Zen 6 Will Support Both 64 MB and 32 MB BIOS Motherboards

The discussion around AMD’s upcoming Zen 6 architecture continues to intensify after ASUS recently unveiled its new B850M AYM OC motherboard, built for overclocking enthusiasts. In its promotional materials, ASUS explicitly confirmed Zen 6 CPU support for this AM5 motherboard, making it the first vendor to publicly acknowledge compatibility with AMD’s next-generation processors. However, what drew even more attention was the mention of “64 MB BIOS” in the reveal image, sparking debates about whether existing AM5 motherboards equipped with 32 MB BIOS chips would also support Zen 6.

According to recent reports and a post by well-known leaker @9550Pro (HXL) on X, both 32 MB and 64 MB BIOS motherboards will be compatible with Zen 6 processors. While this information remains unofficial, it suggests that current 600-series and upcoming 800-series AM5 motherboards will both support Zen 6 without the need for a BIOS upgrade or hardware revision.

Both 32MB and 64MB variants of the 600-800 series AM5 motherboards support Zen 6. https://t.co/CAGDD392Z9

— HXL (@9550pro) October 10, 2025

If accurate, this would mark a significant improvement in AMD’s long-term platform support, continuing the company’s reputation for backward and forward compatibility within its socket generations.

When asked whether motherboard manufacturers might need to remove Zen 4 CPU support from 32 MB BIOS motherboards to make room for Zen 6 microcode, HXL dismissed the idea. He noted that the problem seen on the AM4 platform—where 16 MB BIOS chips struggled to support all Zen generations, forcing manufacturers to drop older CPU support—should not occur this time.

This reassurance implies that AM5 motherboards equipped with 32 MB BIOS chips will continue to support Zen 4, Zen 5, and Zen 6 processors, preserving full compatibility across the AM5 lineup.

If this leak proves true, AMD’s AM5 platform would deliver an unprecedented level of flexibility for PC builders and enthusiasts. Users with 600-series boards may not need to upgrade to enjoy Zen 6’s improvements, while those investing in new 800-series motherboards can still benefit from broader BIOS storage for potential future updates.

AMD has not yet officially commented on BIOS compatibility for Zen 6, but given the company’s consistent strategy of extending platform lifespans, the claim seems technically plausible. For now, users are advised to await confirmation as AMD’s next-generation launch draws closer.

Do you think AMD will maintain full AM5 compatibility for Zen 6, or will some limitations emerge once the CPUs launch? Share your thoughts below.