Both Windows XP Home Edition and Windows XP Professional
treat a Hyper-Threading enabled computer as a multiple processor computer. You
can verify this by looking in Device Manager, under the
- In Computer, you can expect the computer
to be described as a multiprocessor PC.
- In Processors, you can expect multiple
processors to appear installed.
If the Hyper-Threading feature is disabled in the
computer's BIOS, Windows XP may describe the computer as a Uniprocessor PC and
may show only a single processor installed in Device
When Hyper-Threading is enabled in the computer's
BIOS, Windows XP automatically upgrades the hardware abstraction layer (HAL) if
it must use a multi-processor HAL, and an additional processor or processors
may be installed and listed under Processors
. The system will prompt you to restart so that the new
settings can take effect.
Hyper-Threading CPUs contain a second (virtual) CPU. With
this feature, multi-threaded applications can run threads in parallel in each
processor. As a result, you experience more efficient use of the processor
resources and better performance with multi-threaded applications.
Windows XP HomeNote: Windows XP Home can use a maximum of one (1) physical processor.
However, because Hyper-Threading is supported, the operating system takes
advantage of the second (virtual) processor.