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The IBM System p5™ 520, 550 and 550Q are the latest IBM POWER5™ processor-based servers designed for commercial and high performance compute-intensive workloads. The p5-520 and p5-550 servers are 2-way and 4-way Dual-Chip Module systems running at 1.9GHz while the p5-550Q is 4-way and 8-way 1.5GHz Quad-Core Module systems. All three systems support the AIX 5L™ (AIX 5L V5.3 and AIX 5L V5.2) and Linux® (SUSE LINUX Enterprise Server 9 (SLES 9) for POWER™, and Red Hat Enterprise Linux AS 4 (RHEL AS 4) for POWER operating systems. In this paper, we examine key features of the three systems and discuss their performance under such industry standard benchmarks as SPEC CPU2000, SPEC OMP2001, SPECjbb2000, SPECjbb2005 and LINPACK. The measured benchmark results demonstrate the leading edge performance of the new IBM POWER5+™ systems in commercial and high performance workloads.
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