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-   -   Windows xp sp1 doesn't notice dual cores. (http://www.hardwarecanucks.com/forum/troubleshooting/13294-windows-xp-sp1-doesnt-notice-dual-cores.html)

andynerd December 27, 2008 06:32 PM

Windows xp sp1 doesn't notice dual cores.
1 Attachment(s)
In my hardware manager it shows two cpu's like it should but when I open up task manager it acts like there is only one cpu!

enaberif December 27, 2008 06:36 PM

Is this a fresh install? Or a cpu upgrade?

If cpu upgrade you need to re-install.

andynerd December 27, 2008 06:38 PM

I just installed windows and upgraded from sp2 to sp3

enaberif December 27, 2008 06:43 PM

Click the "Computer" and it should show ACPI.

Otherwise try:
Annoyances.org - How to change back to ACPI? (Windows XP Discussion Forum)

AkG December 27, 2008 06:43 PM

Edit: others answered before me while I was typing :)
Long story short:
Sounds like ACPI multiprocessor support is not enabled. You need to enable it!

andynerd December 27, 2008 06:51 PM

Under the computer drop down it says:

Advanced Configuration and power Interface (ACPI) PC

andynerd December 27, 2008 08:20 PM


Originally Posted by malmal (Post 131976)
Go to View in the task manager . then cpu history then one graph per cpu.:biggrin:

already set to that did nothing

andynerd December 27, 2008 09:59 PM


Originally Posted by malmal (Post 131994)
Go to run, msconfig, bootini, advanced, check there is a 2 in the numproc box.
Not sure if this will work as my comp has nothing in the numproc box , yet I see two charts.:biggrin:

it Only gives me the option of a one

andynerd December 27, 2008 10:23 PM

ARTICLE: ACPI Uniprocessor to Multiprocessor HAL Upgrade

This amazing tut made it work for me :D

andynerd December 28, 2008 09:03 AM

ahah aww that so nice of you working so hard on my problem ^^ thanks :D

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