Hyperthreading CPU but 2nd "CPU" not shown

[John7]

Hi,



On a customer's system the second "cpu"does not show although:
+ CPU supports hyperthreading,
+ BIOS has hyperthreading enabled
+ ACPI 2.0 enabled.
+ Windows "ACPI multiprocesor-pc" CPU device driver manualy selected.
+ New hardware detected, 2x reboot.

But in Device Manager still 1 processor listed.
In Task Manager still 1 Performance Window.
How to fully enable hyperthreading ?


System description
P4 3GHz with hyperthreading.
2GB DDR400
WinXP Home + SP3
Office 2007
All updates
NOD32 A/V
RocketDock desktop enhancement


TIA,
John7

 

[AJR]

Some Confusion - hyperthreading permits "one" processor to process more than
one thread concurrently (providing application is programmed to take
advantage).

Hyperthreading by itself does not indicate multiple cores or processors.

 

[John John (MVP)]

What you say is true but a hyperthreaded processor will show up as two
logical processors in the Device Manager.

John

 

[Ricky]

Open task manager..performance tab..view button..and under cpu history be
sure 'one graph per cpu' is picked.

 

[Pavel A.]

Open a command prompt and type:

set NUMBER_OF_PROCESSORS

If this shows 2, then HT is working

--PA

 

[John7]

To all,

Please stop this architecture discussion.
I am trying to get a new customer's PC fixed.

Technical details described in initial post.
Please read first.

Additions:
- Asus P4PE2-X bios 1004
- 2x 512MB DDR400 (checked OK)
- Maxtor 160GB HD

According CPU-Z
P4 Prescott 90nm
Fam/Model/Step : F / 4 / 1
xFam./xMod./Rev: F / 4 / E0

Core 3GHz
Mult. 15x
Bus 200MHz
FSB 800MHz


Thank you.
John7

PS: considering bios 1005 although it states no improvements on this.

 

[John7]

To all,

Please stop this architecture discussion.
I am trying to get a new customer's PC fixed.

Technical details described in initial post.
Please read first.

Additions:
- Asus P4PE2-X bios 1004
- 2x 512MB DDR400 (checked OK)
- Maxtor 160GB HD

According CPU-Z
P4 Prescott 90nm
Fam/Model/Step : F / 4 / 1
xFam./xMod./Rev: F / 4 / E0
!!! No selection of cores possible despite enabled HT .

Core 3GHz
Mult. 15x
Bus 200MHz
FSB 800MHz


Thank you.
John7

PS: considering bios 1005 although it states no improvements on this.

 

[John7]

Thanks Pavel,

As I expected:
NUMBER_OF_PROCESSORS = 1
Another proof that HT is not working.

Still puzzled,
John7

 

[John John (MVP)]

Install the chipset drivers and update the processor drivers.

John

 

[Paul]

To all,

Please stop this architecture discussion.
I am trying to get a new customer's PC fixed.

Technical details described in initial post.
Please read first.

Additions:
- Asus P4PE2-X bios 1004
- 2x 512MB DDR400 (checked OK)
- Maxtor 160GB HD

According CPU-Z
P4 Prescott 90nm
Fam/Model/Step : F / 4 / 1
xFam./xMod./Rev: F / 4 / E0

Core 3GHz
Mult. 15x
Bus 200MHz
FSB 800MHz


Thank you.
John7

PS: considering bios 1005 although it states no improvements on this.

Judging by what I see here, I like the sound of your BIOS upgrade theory.
There is a 1006.001 available on the download page.

http://support.asus.com.tw/cpusupport/cpusupport.aspx?SLanguage=en-us&model=P4PE2-X

Also, read the warnings for each BIOS in the BIOS list.

http://support.asus.com.tw/download/download.aspx?SLanguage=en-us&model=P4PE2-X

Good luck,
Paul

 

[Pavel A.]

Then - try a *clean* XP install form a *generic* disk (or, to save time,
some Linux "live cd" that supports multiple CPUs).
If all these won't see both CPUs, then you have a BIOS or hardware problem.

In some cases, update over uniprocessor XP installation won't update kernel
to multiprocessor.

Regards,
--PA

 

[cocopops103]

if the processor is AMD, have you ran the dco? available from their website
that is if it's a processor upgrade from single to dual core.

 

[John7]

To all,

Thank you all for your help.

A BIOS update to v1005 did the trick.
Release notes do not mention this bug fix.

John7