Included in this collection because UCSC owns lots of these. The 6610-24 has one packet processor with 4 MB of buffers. Each packet processor has 4 cores, each with 1 MB of buffers. Each core serves six Gig-E ports and two 10 Gb/s ports. There is a 48-port version of this switch that has two packet processors which doubles the total buffer memory.
Brocade has a nice architectural review. The paper does not explain how multicast packets are processed.