Cannot get hyper threading to work on P4P800.

Chum

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Aug 11, 2002

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St. Louis, Mo. U.S.A.

• Nov 16, 2003

• #1

(UPDATE!!!)Cannot get hyper threading to work on P4P800.

I recently upgraded to WinXP Pro...So I thought...COOL, now I can turn on Hyper-Threading...I enabled it in BIOS...but according to Sandra and Device Manager it is still off...what can I do?

 

Last edited: Nov 21, 2003

Heatsinkguy

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Oct 5, 2003

• Nov 16, 2003

• #2

make sure ur 2.6ghz is a 800fsb capable cpu with ht support and make sure ur mobo supports ht

 

Heatsinkguy

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Oct 5, 2003

• Nov 16, 2003

• #3

dont check using sandra, check using bios

 

OP

Chum

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• Nov 16, 2003

• Thread Starter
• #4

Perhaps I should update my Sig...It is a P4 2.6C 800 fsb chip. BIOS has hyperthreading enabled...and it does not change back or anything...how can I tell in Windows XP if HT is actually being used?

 

Needitcooler

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Apr 7, 2002

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Seattle

• Nov 16, 2003

• #5

Go to your device manager under the control panel and make sure there are two CPU's listed under the processor heading. If so, HT is enabled and being used.

 

OP

Chum

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• Nov 17, 2003

• Thread Starter
• #6

Device mmanager only reports 1 CPU...what can I try?

 

shiyan

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Aug 23, 2003

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behind the wheel

• Nov 17, 2003

• #7

try doing a fresh install? maybe because you did an upgrade, XP Pro just took over a lot of the settings.

not sure actually.

 

cphastings

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Jul 18, 2003

• Nov 17, 2003

• #8

I've seen the answer to this one before. Run a forum search on hyperthreading or hyper-threading and you should be able to find the answer. I know it has something to do with Device Manager though. Sorry can't be of more help.

 

Ralf Hutter

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Peoples Republik of Kalifornia

• Nov 17, 2003

• #9

Double check your Device Manger again. Go into the Performance Tab, then "View>CPU History" and check "One Graph per CPU".

If that's not available you will have to fresh install Win XP.

 

Ritalin

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Sep 23, 2003

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Herzlya, Israel

• Nov 17, 2003

• #10

upgraded? try formatting

 

N

nipster

Pentium III 1.0 ghz collector

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May 1, 2002

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Tampa, Florida. USA

• Nov 17, 2003

• #11

go to device manager

click on computer type

it should be "ACPI computer" or "ACPI Uniprocessor PC"

go to properties / update driver

select "see all hardware types"

select "ACPI Multiprocessor PC" from the list

reboot

enjoy...

NOTE: this does fail sometimes and leave you with a BSOD, its not a 100% thing, so make sure you back **** up first...

 

S

stmok

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Feb 26, 2002

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Australia

• Nov 17, 2003

• #12

Looks like your HAL (Hardware Abstraction Layer) is loaded for Single CPU mode only...You need to change this to Multiprocessor HAL.

(1) You can do what nipster suggested

OR

(2) Safest way is do a clean install.

OR

(3) IF that still doesn't pick it up...On booting up with WinXP Setup CD, press F5 or F6 (I don't remember), then select "ACPI Multiprocessor PC" from a list of PC types. This will manually force WinXP into loading a multiprocessor HAL.

Everything else should setup like usual.

 

OP

Chum

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St. Louis, Mo. U.S.A.

• Nov 17, 2003

• Thread Starter
• #13

Looks like I'll have to do a clean install...

 

OP

Chum

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St. Louis, Mo. U.S.A.

• Nov 17, 2003

• Thread Starter
• #14

Looks like I'll have to do a clean install...the things nipster and stmok suggested do not show up...one more thing maybe...

What if I remove ACPI PC from device manager...then reboot...?

Also, is HT worth the trouble...will I see a performance increase?

 

JKeefe

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May 25, 2003

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Basking Ridge, NJ

• Nov 17, 2003

• #15

Chum said:

Also, is HT worth the trouble...will I see a performance increase?

Click to expand...

Yes, during multitasking. You can also do things like run two instances of F@H. In any case you will be getting the most out of your processor, so it is definitely worth the hassle.

 

Last edited: Nov 19, 2003

idioteQnology

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Jersey

• Nov 19, 2003

• #16

chum u also post on sprint pcs forums?

 

OP

Chum

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• Nov 19, 2003

• Thread Starter
• #17

idioteQnology said:

chum u also post on sprint pcs forums?

Click to expand...

Nope, never heard of it.

 

OP

Chum

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• Nov 21, 2003

• Thread Starter
• #18

Got IT!!!!

One of 2 things fixed it (or a combination of both). Started a repair of XP, on first reboot went into BIOS...varified HT enabled....then on another BIOS screen I noticed these were all disabled...(1.) ACPI 2.0 Support (2.) ACPI APIC Support (3.) AML ACPI Table...I enabled them as well...and after (repair) install Device Manager shows 2 CPUs!!! Performance graph on Task Manager shows 2 CPUs!!!

Do not know now...but it could have been just the ACPI entries in BIOS.