I'm preparing for an xSeries class in IBM next week. One of my worries was the lack of coherent material on the Internet to properly explain all the technologies currently involved in todays Intel-based servers. That is, until I found this wonderful IBM redbook entitledTuning IBM eServer xSeries Servers for Performance.
The book is simply fantastic. Chapters 4 to 8 cover the essential components of Intel-based and Intel-compatible servers, namely, processor and cache, I/O bus, memory, disk, and networking. The authors cover everything in great detail, without the typical marketing hype.
Check it out!