Enabling both cores

oldshirts

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Apr 25, 2008
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I have looked tirelessly for an answer to this, and I am sure someone will point out where I should have looked, so sorry if this is already dealt with elsewhere but I can't find it, I'm sure it's a simple problem that almost everyone should know the answer to, but I don't.

I have an Intel Pentium D 805 2.66ghz in an Intel motherboard based PC, running Vista Ultimate. These factors are unlikely to change.

I used to enjoy seeing my multimeter telling me how fast both my Cores were running, sweet. Then I had a problem with some software or other, can't remember which, might have been "Last FM", and the advice I took was to disable one of the cores so I was only running a single core, so I followed the instructions and made the changes.

Now I want to run both cores again, but I can't remember what I did to change it.

I've run diagnostics such as PC Wizard which tells me my Core 1 activity is 100% but that my Core 2 activity is 0%. My Multimeter tells me that Core 1 is working, but that Core 2 is stuck at 0%. I have run CPU-Z, it tells me there is only one core running.

Can anyone help please? How do I enable both cores?

Any help would be much appreciated.
 
Access Task Manager.
Choose the Processes tab.
Right-click the process associated with the problem application.
Select the Set Affinity command. (If you don't have a dual-core system, you won't see the Set Affinity command.)
From the Processor Affinity dialog box, set one of the CPU check boxes.
 

joshmac03

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i'm not sure if this is it but run msconfig and check the boot tab and then advanced options and check if the number of processors is set to 1 maybe?
 

nikywilliams

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I know you are using Vista, but in XP you can run msconfig and in the boot.ini tab there is a button for the advanced options, in here you can define how many cores/processors Windows recognizes. Make sure that says 2. Hope this helps.
 

oldshirts

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Thanks Joshmac03, I knew someone would find it, however it only has option for 1 processor, although I think that was where I found it before.

Evongugg, I think I may be getting confused here, I know that everything used to tell me that both cores were working, and I had tried looking to set the Affinity, but when I right-click it is not in the menu.

Is there a difference between Dual Core, Pentium D, Core Duo etc? (well there is obviously a differnece but you know what I mean) Like I said, it always used to work, and now it doesn't. Could my processor be US?