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Windows 7: Hyperthreading on Pentium4

09 Dec 2009   #1
FTG

Windows 7
 
 
Hyperthreading on Pentium4

Hi,

I have a Pentium 4 HT 2.6Ghz cpu. When I was using XP, the task manager displayed 2 cpu graphs, showing that Hyperthreading was active. But now in Windows 7, I only see 1 cpu graph. I thought Windows 7 supports hyperthreading ?

The only thing I might have possibly done wrong, was that I disabled HT in the BIOS when I installed Windows 7, only remembering to turn it on in the BIOS after installation.

Can someone with a Pentium4 HT cpu confirm that hyperthreading is actually supported in Windows 7 ?


My System SpecsSystem Spec
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09 Dec 2009   #2
Airbot

Windows 7 Ultimate x64 SP1
 
 

I don't have a Pentium 4, I have a corei7, but hyperthreading works.

Hyperthreading on Pentium4-captureuu.jpg


My System SpecsSystem Spec
09 Dec 2009   #3
darkassain

Windows 7 Ult x64(x2), HomePrem x32(x4), Server 08 (+VM), 08 R2 (VM) , SuSe 11.2 (VM), XP 32 (VM)
 
 

yep i have it...
Hyperthreading on Pentium4-p4.png
if you disabled it in the bios then it acts as one core as i remember it (and i believe it stays that way although you shouldn't quote me on that)....

just in case check if this is enabled...
Hyperthreading on Pentium4-ht.png


My System SpecsSystem Spec
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09 Dec 2009   #4
FTG

Windows 7
 
 

Darn, looks like the feature is not enabled because I installed Windows 7 without turning it on in the BIOS. Oh well, will need to reinstall.
My System SpecsSystem Spec
10 Dec 2009   #5
7thangel

win xp pro/win 7 64
 
 

when i had my p4, i didn't have to reinstall to turn on/off hyperthreading in my bios and neither should you. it's a simple change in your bios settings
My System SpecsSystem Spec
10 Dec 2009   #6
pillainp

Windows 8.1 Professional 64-Bit
 
 

Control Panel>Device Manager: One or two CPU's listed? (If HT is on, the Device Manager should list two virtual CPU's under the Processor>Your Processor heading.

Task Manager>Performance Tab>View>CPU History>One Graph All CPU's or One Graph Per CPU selected?
My System SpecsSystem Spec
10 Dec 2009   #7
Digerati

Windows 7 Profession 64-bit
 
 

I agree with 7thangel. You should not have to reinstall - just enable it in the BIOS. But do make sure first you have TM set to display all as shown in darkassain's 2nd image.
My System SpecsSystem Spec
10 Dec 2009   #8
pillainp

Windows 8.1 Professional 64-Bit
 
 

Would the "Number of CPU's" setting under the Boot>Advanced Options tab in MSConfig have any effect on this?

Would you check and see what it says? If it reads "1", set it to "2", reboot and see what happens.
My System SpecsSystem Spec
10 Dec 2009   #9
darkassain

Windows 7 Ult x64(x2), HomePrem x32(x4), Server 08 (+VM), 08 R2 (VM) , SuSe 11.2 (VM), XP 32 (VM)
 
 

Quote   Quote: Originally Posted by pillainp View Post
Would the "Number of CPU's" setting under the Boot>Advanced Options tab in MSConfig have any effect on this?

Would you check and see what it says? If it reads "1", set it to "2", reboot and see what happens.
it should in theory disable the virtual core..
and yeah i agree it should not take a reinstall for windows to enable HT
My System SpecsSystem Spec
10 Dec 2009   #10
Digerati

Windows 7 Profession 64-bit
 
 

You do not have two CPUs. You should leave it at 1.
My System SpecsSystem Spec
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 Hyperthreading on Pentium4




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