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IBM eServer p5 550 Express
64-bit POWER5
Clock rates (Min/Max)
System memory (Std/Max)
512MB / 64GB
Internal storage (Std/Max)
36.4GB / 15.2TB
Performance (rPerf range)
3.25 to 18.20

The IBM eServer® p5 550 Express system is a member of the eServer p5 Express family. Competitively priced, with proven POWER5™ processor technology, this system is packed with the capabilities smaller and mid-sized companies need—including some that previously were found only in the most sophisticated servers from IBM. The p5-550 Express system features proven IBM technologies including IBM Virtualization Engine™ with Micro-Partitioning™ and simultaneous multi-threading. These capabilities help smaller and mid-sized companies lower administrative costs and increase system utilization while improving application performance and ensuring applications continue to get the resources they need-when they need it.

Common features
· Rack-mount or deskside packaging
· 2- or 4-way SMP design
· 64-bit POWER5 technology
· Mainframe-proven RAS including dynamic firmware updates
· Dynamic LPAR support
· IBM Virtualization Engine support (optional)
· Micro-Partitioning
· Shared processor pool
· Virtual I/O
· Virtual LAN
· Up to 8 optional I/O drawers
· HACMP support for near continuous operation
· AIX 5L V5.2, AIX 5L V5.3 and Linux distributions from Red Hat, Inc. and SUSE LINUX

Hardware summary
· 1-way, 2-way or 4-way 64-bit 1.5GHz POWER5 processors
· Level 2 (L2) cache: 1.9MB (1-, 2-way); 3.8MB (4-way)
· Level 3 (L3) cache: 36MB (2-way); 72MB (4-way)
· Up to 15.2TB internal storage (with optional I/O drawers)
· Four standard internal disk bays plus four optional (36.4/73.4/146.8GB 10K rpm or 36.4GB/73.4GB 15K rpm disks)
· Up to 8 optional I/O drawers
· Two slimline media bays and one standard
· Five hot-plug 3.3v PCI-X adapter slots (4 long, 1 short 64-bit/133MHz)

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