Please note that this post is tagged as a rumor .
AMD Ryzen 10000 Zen6 desktop CPUs to be supported on both 32MB and 64MB BIOS motherboards
Users should expect 600- and 800-series motherboards to support next-gen Zen6 CPUs, regardless of the BIOS size.

Recently, ASUS announced a new overclocking motherboard based on the B850 chipset. This AM5 board includes an interesting feature that remains listed on the company’s website. ASUS claims that the motherboard is compatible with upcoming Zen 6 CPUs, and this message appears to be linked to the board’s 64 MB BIOS chip.

Source: ASUS
Naturally, this sparked discussion about whether 64 MB chips are required to support Zen 6. Is AMD planning to release so many AM5 processors that 32 MB chips would no longer be sufficient? We’ve seen a similar situation before with early Zen 4 motherboards, which initially shipped with 16 MB chips and were later upgraded to 32 MB. That limitation forced many manufacturers to drop support for some older AM4 CPUs as AMD continued expanding the lineup, now in its ninth year .
The good news is that both 32 MB and 64 MB AM5 motherboards are expected to support Zen 6 CPUs, so no upgrade should be necessary. The bad news is that this is not official information but rather a claim by the well-known leaker HXL, who recently commented on related reports.
Both 32MB and 64MB variants of the 600-800 series AM5 motherboards support Zen 6. https://t.co/CAGDD392Z9
— HXL (@9550pro) October 10, 2025
HXL added that even boards with 32 MB chips are unlikely to see a reduction in supported CPUs, though again, this has not been confirmed by AMD.
This should not happen again.
— HXL (@9550pro) October 12, 2025
If these rumors prove true, AMD will continue to expand its AM5 CPU lineup without breaking backward compatibility with existing 600- and 800-series motherboards. However, some lower-end 600-series boards could face limitations in features or memory support compared to newer 900-series models.
Source: HXL via TechPowerUP