Moore's Law states that CPU processing power doubles every 24 months.... Additionally software licensing in most cases is directly priced according to the number of CPU you are running the application operating them on.... You also want to ensure that the equipment you buy will be fully utilized (run at full speed/workload) in order to avoid buy more equipment, software licenses, administration, datacenter floor space and unecessary power and cooling costs than you have to.
With the advent of server virtualization and far more powerful cpu's servers that typically run at low utilization rates of 13%-25% utilization can be consolodated on to 1/2 to 1/3rd as many servers while also improving reliablity as most server virtualization applications include server/workload failover capabilties.
With over 40 years of experience designing high availability hardware and software, IBM Server and Storage Systems solutions keep your business running. With extensive background in Predictive Failure Analysis™ and dynamic system adaptation, IBM offers a unique platform that unleashes extraordinary reliability, availability and serviceability (RAS) capabilities for your business.
Keeping in mind that application licensing and power costs alone can create tremendous can more than justify most large consolodation projects.