Performance impact of resource conflicts on chip multi-processor servers // PARA’06 Proceedings of the 8th international conference on Applied parallel computing: state of the art in scientific computing. Pages 1168—1177, ISBN 978-3-540-75754-2: «Sun Fire E25K server, … can scale up to 72 processors executing 144 threads simultaneously. … The off-chip L2 cache is 16 MB in size (8 MB per core). … Each UniBoard consists of up to four UltraSPARC IV processors, their L2 caches, and associated main memory. … In order to maintain cache coherency system wide, the snoopy cache coherency protocol isused within the UniBoard and directory-based cache coherency protocol is used among different UniBoards.»
