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IBM Journal of Research and Development  
Volume 46, Number 1, Page 5 (2002)
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POWER4 system microarchitecture

by J. M. Tendler, J. S. Dodson, J. S. Fields,Jr., H. Le, B. Sinharoy
The IBM POWER4 is a new microprocessor organized in a system structure that includes new technology to form systems. The name POWER4 as used in this context refers not only to a chip, but also to the structure used to interconnect chips to form systems. In this paper we describe the processor microarchitecture as well as the interconnection architecture employed to form systems up to a 32-way symmetric multiprocessor.
Related Subjects: Arithmetic and logical unit design; CMOS; Computer organization and design; Integrated circuit design; Memory (computer) design and technology; Memory, cache; Microprocessor systems and applications; Multiprocessors; Packaging; Reduced-instruction-set computers (RISC); Servers; Thermal conduction module (TCM)