AMD’s next-gen 600 series chipsets may lack support for PCIe Gen 5 and instead leverage a Gen 4.0 x4 interconnect with the CPU. This is in direct contrast to Intel’s latest 600 chipset family released alongside Alder Lake which has a PCIe 5.0 x16 slot for even the lowest-end H610 boards. It’s unclear why AMD would decide to omit Gen 5 support from its first AM5 boards, or if this leak is actually legit.
Komachi Ensaka has proved to be a very reliable source in the past which makes this all the more puzzling. With the 500 series, the B550 chipset also lacked Gen 4 support, and the same was enabled via the CPU.
The higher-end X570 chipset supported Gen 4 x4 which allowed AIBs to implement up to three PCIe x16/x8 slots in addition to as many as four M.2 slots.
AMD has already confirmed that its Ryzen 7000 family will support PCIe Gen 5 so we’re likely looking at a CPU implementation here rather than the chipset. The X670 chipset is supposed to be a dual-chiplet B650 which makes it unlikely that even the former will support the Gen 5 standard. Although this won’t have any real impact on performance, Team Red will most certainly lose points on comparison tables.