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Dual core processsor only running on 1 processor core

When I first got this laptop, Windows Task Manager showed activity on both processor cores.

After a couple of weeks ony 1 core was showing. I reinstalled Windows to try to fix it and also checked CMOS BIOS settings.

I'm still only running on 1 core.

Any ideas? Thanks.

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  • tekkie Jul 31, 2009

    Thanks for the suggestion. This opton is already checked on my PC.
    p.s. I am running XP Pro.

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With TaskManger open click View, CPU History and ensure One Graph per CPU is checked

Posted on Jul 30, 2009

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Laptop doesnt boot when multi core processing is enabled


By multi core I assume you mean when enabling all of the true processor cores. In your laptop's case it's a Dual Core processor which means there are only 2 phyiscal cores and does not contain HyperThreading Technology (HT Technology) which enables "Virtual processor cores"

Could be caused by a couple of things:

1. Your processor doesn't support multi-core processing which is a possibility given there is no HT technology for your CPU. In which case there is nothing to fix. Even though the BIOS may have this option. You can check to see if both cores are enabled when you have multi-core processing disabled; In windows right click on your taskbar and click on "Task Manager" Click on the performance tab. You will want to count the number of processor displays you see. Refer to this to see what I mean:

f6c39969-f900-4d19-bf1f-64040578cc05.jpg

b129bf4a-74da-49fb-868b-3bfda7229b97.png

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2. You are running Core2Duo CPU with dual physical processors and have disabled 1 of the 2 cores because your laptop won't boot. This sounds more like you need to update the BIOS on the motherboard or maybe a bad CPU might be the cause as well.

Hope this helps.

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Dual core issue


If you are able to start the application, press control+alt+delete to bring up the task manager window. Find the application in task manager, right click on it, and left click "Set Affinity". Now, remove one of the checks so that the process is only allowed to run on one processor core.

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I just bought a Sony Vaio at best buy and the ''geek squad'' wanted $40 to ''activate'' the second processor that supposedly doens't come active, they also were bragging that they would optimize the system...


They said what? Sounds like,
"Come sit beside me for a while, said the Spider to the Fly".

They're full of beans. Only if you have a computer that has TWO separate processors, that are in two processor sockets, is this done.

Your Sony laptop, has a processor made up of a single die chip, with two processor cores on it.

Dual core processors have their two processor cores activated all the time.
It is only if the second processor core is needed, that it will run.

The second processor core will operate if:

1.If more than one thread requires using both processor cores.
2.If an intense game requires both processor cores to operate.
3.If opening multiple programs, or applications, both processor cores will operate.
4.Using a 3D program that requires a lot of processor power.

To what extent, or percentage, that the second processor core operates at, is up to the task that is required of it.

It's like having a fuel dragster to just go down to the store, and buy bread. You would idle down to the store.
[One processor core operating]

Have to get down to the end of the dragstrip F-A-S-T?
Then you open the engine wide open.
[Two processor cores operating at 100%]

1.While you're on the internet, press the CTRL, ALT, and Delete keys, At The Same Time, to bring up the Task Manager. Now click on the Performance tab.

View CPU Usage.

2.Now open an intense program. (Such as an intense game for example)
Press CTRL, ALT and Delete keys at the same time, to bring up Task Manager. Click on the Performance tab.
Again, view CPU Usage.
Both processor cores are operating at 80% to 100%.

Optimize your computer system? What 'secret' do they supposedly possess?
NONE!

1.Keep your Start-Up menu down to a minimum. Only have the programs that need to start, when the computer starts. Activate the other programs manually, as you need them.

2.Keep your registry clean. I recommend using a registry cleaner on a regular basis. I use CCleaner. This registry cleaner is free, and works better than paid for versions. If it was not free, I would not recommend it here. That would be advertising.

3.Delete programs that you hardly use. Applications also. (DO NOT delete Windows programs, just programs you have downloaded, or manually installed yourself)

4.Keep your harddrive storage space to less than 50 percent full. Once a harddrive fills past this point, the computer starts slowing down.

Use external storage for more space. (External harddrive, and USB flashdrive for two examples)

As you can see, Numbers 1, and 3 above, may not apply to you at the moment. You indicate that you just bought the Sony laptop. Therefore you may not have installed anything yet. This info is for the future.

Numbers 2, and 4 may apply to you now. I would use a registry cleaner from the 3rd or 4th day, if you visit a lot of websites.
I would also use an external storage device from Day 1, if I had a lot of documents, and other information to store.
(School, College, Business) Keep your harddrive as close as it is/was, to Day 1.

(MAKE a backup of your harddrives contents right now! This is your Restoration Disk should something happen to your laptop in the future)

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