Hyperthreading and OS

[Dmitrim]

Recently bought a hyperthreading enabled MB and P4 CPU.
According to Intel.com, Windows XP is required for HT to work.

I assumed this was correct since my clean install of Windows 2000 Pro (service pack 4)
reported one CPU (with HT enabled in the bios).

however...

I have a second Win2000 installation (no service packs..)
on a seperate hardrrive. This version reports that I have two
CPUs, as does A/W Maya during rendering..

Whats going on here?

[bassman]

Actually I believe Win2K is supposed to report two processors on a HT CPU machine; what Win version is the PC that reports only one CPU?

[MrBurns]

Ha already said, that the version, which showed only one CPU was Win2000 Sp4.

Maybe the version, that shows two CPUs is a dual CPU version, and the other one is a single CPU version.

[Dmitrim]

Both installations are using the same Windows version (same disk, same serial).

I did another install on a third harddrive. It reports only 1 cpu..

On a side note, I assumed HT was just a hyped feature, but... it actually does improve performance somewhat, especially with rendering (49sec per frame --> 33 sec per frame.. pretty cool).

[herosrest]

Which HAL (hardware abstraction layer) dll's are used in the different installs.

[Dmitrim]

ah...

Uniprocessor computer type was installed instead of multiprocessor.. Problem solved.

Thanks Herosrest