POWER8 is a family of superscalar symmetric multiprocessors based on the Power Architecture, and introduced in August 2013.
POWER8 is designed to be a massively multithreaded chip, with each of its cores capable of handling eight hardware threads simultaneously, for a total of 96 threads executed simultaneously on a 12-core chip. The processor makes use of very large amounts of on- and off-chip eDRAM caches, and on-chip memory controllers enable very high bandwidth to memory and system I/O. For most workloads, the chip is said to perform two to three times as fast as its predecessor, the POWER7.
POWER8 comes in 4-, 6-, 8-, 10- and 12-core variants.
IBM Scale Out servers, supporting one or two sockets each carrying a dual-chip module with two six-core POWER8 processors. They come in either 2U or 4U form factors, and one tower configuration. The "L" versions run only Linux, while the others run AIX, IBM i and Linux.
· Power Systems S812L – 1× POWER8 DCM (4, 6 or 8 cores), 2U
· Power Systems S822 and S822L – 1× or 2× POWER8 DCM (6, 10, 12 or 20 cores), 2U
· Power Systems S814 – 1× POWER8 DCM (6 or 8 cores), 4U or tower
· Power Systems S824 and S824L – 1× or 2× POWER8 DCM (6, 8, 12, 16 or 24 cores), 4U