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The S/390 G5, the latest generation IBM mainframe system, more than doubles the performance of its predecessor. The microprocessor used in the system is a sophisticated CISC processor that features a large cache and a very high clock frequency to achieve excellent performance. We discuss the microarchitecture of the processor followed by a description of how this processor is integrated into the system. Finally, we consider the state-of-the-art reliability and availability features that make this mainframe system unique.

B. W. Krumm et al., "IBM's S/390 G5 Microprocessor Design," in IEEE Micro, vol. 19, no. , pp. 12-23, 1999.
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