Core licenses are sold in packs of two (a 2-pack Core License) and each processor needs to be licensed with a minimum of eight cores (four 2-pack Core Licenses). Each physical server, including single-processor servers, will need to be licensed with a minimum of two processors and 16 cores (eight 2-pack Core Licenses). Additional cores can then be licensed in increments of two cores (one 2-pack Core License) for gradual increases in core density growth.