Emerald Rapids is Intel's fifth generation of "Xeon Scalable" server CPUs, succeeding Sapphire Rapids. Emerald Rapids uses the same core design as Sapphire Rapids, but a redesigned chiplet layout (two die instead of four) and much more L3 cache.
Only the XCC products are materially changed; lower-core-count single-chiplet products are mostly the same across generations.
Emerald Rapids uses the Eagle Stream platform, with 8-channel DDR5 up to 5600MT/s (varies by SKU) and 80 PCIe 5.0 lanes.