Here is another follow-up to the February "Ixora News" item Buying Time. One of our subscribers asked Adrian Cockcroft, the author of Sun Performance and Tuning for a second opinion. Here is Adrian's response ...

"Few faster CPUs is a little more efficient and has lower response time.
More slow CPUs gives a flatter more predictable response time curve as the load increases so you can run nearer 100% busy.
Read any book on queuing theory, especially Neil Gunther's Practical Performance Analyst."

See Performance Dynamics for more on Neil Gunther's work, and Performance School for related downloads.