High-performance Servers

IBM System x3950
The IBM System x3950 is built on IBM X3 Architecture that delivers mainframe-inspired enhancements to the high-performance x86 server industry. With a balanced focus on providing breakthrough 64-bit performance and high availability, the x3950 is designed for the changing business needs of enterprise customers - at a low entry price point. 
IBM System x3950 Datasheet

IBM xSeries 440
The powerful xSeries 440 is a 4U rack-optimized, Xeon MP-based 8-way server. The x440 delivers incredible performance and robust manageability for high-performance databases, server consolidation, and mission-critical e-business applications.The x440 can scale to 16-way processing through interconnection of two xSeries 440 chasses.  
IBM xSeries 440 Datasheet

IBM xSeries 445
The xSeries 445 is a high-performance flagship server delivering modular XpandOnDemand scalability, industry-leading IA-32 price/performance, mission-critical availability, and enhanced remote manageability. The xSeries 445 is optimized for server consolidation and high end databases. 
IBM xSeries 445 Datasheet

IBM xSeries 450
The xSeries x450 is a leadership Itanium® Processor FamilyT solution that leverages the proven Enterprise X-ArchitectureT chipset to deliver commercially viable 64-bit systems. The x450 builds on the IBM XpandOnDemandT building-block architecture, which enables you to "pay as you grow." Purchase only the capacity and I/O you need, when you need it, without having to buy costly, underutilized up-front infrastructure.
IBM xSeries 450 Datasheet

IBM xSeries 455
The xSeries 455 brings IBM's unique "pay as you grow" enterprise scalable node technology to the Intel® Itanium® Processor Family 64-bit market. Based on the proven Enterprise X-ArchitectureT chipset, the x455 scales to 16-way SMP, providing the horsepower required for large database and Enterprise Resource Planning (ERP) solutions. This 4U rack-dense server also delivers impressive floating point performance for scientific and technical applications.
IBM xSeries 455 Datasheet