Does Ryzen 7000 work with ECC RAM?

Yes, but only unbuffered (UDIMM) ECC — registered (RDIMM) modules won’t work on standard AM5 boards. Check your motherboard’s QVL for ECC UDIMM support; many budget B650 boards don’t enable it. Gigabyte and Asus mid-range boards usually support it. Worth it for file servers or ZFS, not for gaming.