I've got an IBM ThinkCentre with a P4 3 Ghz and Intel 915 express
chipset. Device manager shows 2 CPU's under Processors and under
Computer it shows Advanced Configuration and Power Interface (ACPI).
The BIOS is the latest available (11/2/05) and the Use Hyperthreading
option is set to Enabled.

When I view task manager, I expect to see two windows for each logical
processor on CPU Usage History but I don't. This tells me
hyperthreading is not being used and I don't know what to try next.
This PC was built from an image that may have been created on a
non-hyperthreaded PC, could that have anything to do with the problem
and how can I fix it short of re-installing the OS (could I try a
repair?)

Thanks,
Mike

Open Task Manager and from the Toolbar select:
View > CPU History > One Graph per CPU

--
Carey Frisch
Microsoft MVP
Windows - Shell/User
Microsoft Community Newsgroups
news://msnews.microsoft.com/

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"Mike" wrote:

| I've got an IBM ThinkCentre with a P4 3 Ghz and Intel 915 express
| chipset. Device manager shows 2 CPU's under Processors and under
| Computer it shows Advanced Configuration and Power Interface (ACPI).
| The BIOS is the latest available (11/2/05) and the Use Hyperthreading
| option is set to Enabled.
|
| When I view task manager, I expect to see two windows for each logical
| processor on CPU Usage History but I don't. This tells me
| hyperthreading is not being used and I don't know what to try next.
| This PC was built from an image that may have been created on a
| non-hyperthreaded PC, could that have anything to do with the problem
| and how can I fix it short of re-installing the OS (could I try a
| repair?)
|
| Thanks,
| Mike

That option is already selected but still only one CPU window appears.