This increases the performance of the frontside bus without the difficulty of high-speed clock signal integrity issues. The end result is an effective burst throughput of 3.2 GBps, which can have a substantial impact, especially on TCP/IP-based LAN traffic.
Hyper-Threading
Hyper-Threading technology enables a single physical processor to execute two separate code streams (threads) concurrently. To the operating system, a processor with Hyper-Threading appears as two logical processors, each of which has its own architectural state - that is, its own data, segment, and control registers and its own advanced programmable interrupt controller (APIC).
For example, Figure 1-9 shows a 16-way x440 complex running Datacenter Server with Hyper-Threading enabled.
Figure 1-9 Datacenter sees 32 processors when Hyper-Threading is enabled on a 16-way configuration
14 IBM ^xSeries 440 Planning and Installation Guide
