Why  eServer  p5 and Pseries?

IBM ® p5 and pSeries® systems for AIX 5L™ and Linux are 64-bit IBM POWER5™ and POWER4+™ servers designed to help you achieve worry-free computing in today's on
demand world.

IBM eServer p5 570 Express (Rack-mount)

Unique building block design for scalable growth from 2 to 8 POWER5 processors and the latest innovations in optional IBM Virtualization
Engine.

Processor 64-bit POWER5
Clock rates (Min/Max) 1.50GHz
System memory (Std/Max) 2GB / 512GB
Internal storage (Std/Max) 36.4GB / 22.9TB
Performance (rPerf range)*** 9.13 to 34.46

Unique building block design for scalable growth from 2 to 16 POWER5 processors and the latest innovations in optional IBM Virtualization Engine and Capacity on demand.

Processor 64-bit POWER5
Clock rates (Min/Max) 1.65GHz / .90GHz
System memory (Std/Max) 2GB / 512GB
Internal storage (Std/Max) 36.4GB / 38.7TB Performance (rPerf range)*** 9.86 to 77.45

Powerful yet cost effective 2 to 8-way rack-mount mid-range SMP server with leading-edge Capacity on Demand (CoD) capabilities, enhanced
flexibility, scalability and mission-critical functionality.

Processor 64-bit POWER4+ Clock rates (Min/Max) 1.20GHz / 1.45GHz System memory (Std/Max) 2GB / 64GB Internal storage (Std/Max) 36.4GB / 14.6TB Performance (rPerf range)*** 4.00 to 18.67

Easy-to-manage 4- or 8-way ultra-dense cluster-optimized server for HPC and BI.

Processor                                64-bit POWER4+
Clock rates (Min/Max)   1.50GHz / 1.70GHz
System memory (Std/Max) 4GB / 64GB
Internal storage (Std/Max)          72.8GB / 2.6TB
Performance (rPerf range)***       15.22 to 21.87

Processor                                   POWER4+
Clock rates (Min/Max)                  1.50GHz
System memory (Std/Max)    4GB / 256GB Internal storage (Std/Max) 72.8GB / 7.0TB Performance (rPerf range)** 13.66 to 46.79