I just recently bought an EPYC4000D4U board, AM5 with 24 CPU lanes flexibly available, all Gen5.
I chose it for 4x NVMe and dual 25Gbit Networking via x8 PCIe card, no chipset lanes required and dirt cheap compared to a lot of other stuff that requires all kinds of adapters, cards and compromises.
Haven’t built the server yet (board and half the parts waiting for rest to arrive), but this is great stuff for a pure and focused NVMe storage server on a (Core/Ryzen) budget.