I have 2 CPUs showing in Task Manager and Dxdiag

[daisyanne]

Just built a new system with a P4 prescott 3.00 g(800FSB) with HT but noticed that in dxdiag it says i have got 2 CPUs: - "Processor: Intel(R) Pentium(R) 4 CPU 3.00GHz (2 CPUs)".

Also in the Task Manager under the PERFORMANCE page > CPU Usage History there are 2 boxes instead of the usual 1. The graphs are virtually a mirror image of each other.

Is this normal with this CPU or has something gone wrong.

any help would be appreciated.

thanks

daisy

 

[DAPUNISHER]

I haven't used an HT system but it sounds like it's par for the course with HT enabled with XP. Bump for confirmation ^

 

[CaiNaM]

yes, it's normal.

 

[charloscarlies]

Originally posted by: CaiNaM
yes, it's normal.

 

[Steve]

With XP, Hyperthreading will report two logical CPUs from one chip. 2000 will report one logical and one virtual (think I got those terms right).

 

[DAPUNISHER]

Originally posted by: sm8000
With XP, Hyperthreading will report two logical CPUs from one chip. 2000 will report one logical and one virtual (think I got those terms right).

I thought 2000 tries to use them as 2 physical CPUs hence the lack of performance under that OS?

 

[daisyanne]

phew!! Thank you all very much.

daisyanne

 

[Steve]

Originally posted by: DAPUNISHER

Originally posted by: sm8000
With XP, Hyperthreading will report two logical CPUs from one chip. 2000 will report one logical and one virtual (think I got those terms right).

I thought 2000 tries to use them as 2 physical CPUs hence the lack of performance under that OS?

You may be right, I may have had those backwards.

 

[Steve]

In fact, I think I did have it backwards. IIRC, if you're using dual Xeons with HT:

XP Pro will show two logical (physical?) and two virtual CPUs
2000 Server - ditto

XP Home and 2000 Pro - can't support 4 CPUs, don't know what they'd show.

Thus, with a single HT CPU, you'd get one logical and one virtual in XP Pro and 2000 Server, while you'd get two logical ones in 2000 Pro and XP Home.

But I'm not sure I got that right....

 

[dguy6789]

Ok here it is.

XP Pro. can handle 2 logical and 2 physical, so if you have 1 p4 3.0C then you have 1 physical and one logical.
windows 2000 can not handle any logical cpus, so a 3.0c on that would be treated as 2 physical cpus.
win xp home does NOT support dual cpus but DOES support ht. It will handle 1 physical and one logical, but not 2 physical.