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Hyper-Threading.... Disabled?

A

ATIIsBetter

[H]ard|Gawd
Joined
Feb 19, 2005
Messages
1,202
My friend has a P4 Skt 478. It runs at 2.4 GHz. 3DMark05 says HT is "avalible, disabled"
I dont think anything under 3GHz ever had HT in the first place, but I'm an "AMD usr 4 evr 1o1" so I'm not very up to date on Intel anymore. Anyway, his bios doesn't say anything about enabling it, so im confused... Thanks for any help.
 
800MHz FSB Northwoods and Prescotts have HT, in addition to the 3.06GHz (533MHz FSB) Northwood. Yes, 2.4GHz processors can have HT.

If the CPU was an upgrade from a previous non-HT CPU, the Computer type in device manager needs to be changed from ACPI/MPS Uniprocessor PC or Standard PC to ACPI Multiprocessor PC. That will enable HT in WinXP.
 
Plenty of P4's below 3.0ghz had HT. All of the 800fsb "C" series chips (which started at 2.4C) had hyperthreading. Also, one "B" series chip had HT: the 3.06B. If you're unsure which 2.4 you have (since it came in all three versions, A B and C) you can use cpu-z to check.
 
2.4C
2.6C
2.8C
2.8E

Yes there are processors below 3.0ghz that have HT. What kind of P4 does he have? I'd like to know alittle more info on the chip, post the results from running cpuid.
 
pxc said:
800MHz FSB Northwoods and Prescotts have HT, in addition to the 3.06GHz (533MHz FSB) Northwood. Yes, 2.4GHz processors can have HT.

If the CPU was an upgrade from a previous non-HT CPU, the Computer type in device manager needs to be changed from ACPI/MPS Uniprocessor PC or Standard PC to ACPI Multiprocessor PC. That will enable HT in WinXP.
Click to expand...

1 <3 U!
Just kidding.... That is very helpful, and I will try that for him, or have him do it soon. The cpu came from a dell that was advertised as having HT and he threw it on an ASUS board. What is the gain we should see from doing this, if it works? Also, isnt there supposed to be some way the RAM needs to be set up on the board... Certain slots or something?
 
ATIIsBetter said:
What is the gain we should see from doing this, if it works? Also, isnt there supposed to be some way the RAM needs to be set up on the board... Certain slots or something?
Click to expand...
HT gains vary from nothing to 15% or more. Not all applications are multi-threaded but running more than one application should show noticeable gains. An example is doing compression (without lowering the task priority) and browing the web. Without HT it's torturous and it's what drove me to a dual core X2 from a single core A64. It used to run fine on my old P4 w/HT.

Nothing special needs to be done to the memory for HT.
 
pxc said:
HT gains vary from nothing to 15% or more. Not all applications are multi-threaded but running more than one application should show noticeable gains. An example is doing compression (without lowering the task priority) and browing the web. Without HT it's torturous and it's what drove me to a dual core X2 from a single core A64. It used to run fine on my old P4 w/HT.

Nothing special needs to be done to the memory for HT.
Click to expand...

Thanks. I'll post if it works or not.
 
Every board I've used with HT had a setting in bios to enable/disable it. I'm not sure if it would show up available/disabled though if it was disabled in bios.
 
Hey I'm the freind with the hyperthreading issue. My motherboard supports it but it is not an option in the bios. How would I change the the computer type in device manager to ACPI Multiprocessor PC?

Edit: Ok I checked cpu-z
Family:F
Model:2
Ext.Family:0
Ext Model:0
Revision:C1
Would any of this info tell you if hyper-threading is available on my cpu?
 
If the FSB speed is 800MHz then you have a HT CPU.

To change the computer type:

1. go to device manager
2. open the Computer node
3. right click the option that shows (probably ACPI Uniprocessor PC or Standard PC) and select properties
4. click the driver tab
5. click the update driver button
6. select no, then click next
7. select install from a specific location, then click next
8. click the don't search option, then click next
9. Select ACPI Multiprocessor PC from the list and click next
10. follow the prompts and reboot when prompted
 
My fsb isn't 800MHz but I didn't read that until I followed your instructions. It made no difference so I'm guessing my cpu does not support it. Oh well, thanks for the info man. Darn 3DMark. Lies!! Heh

-Weezow
 
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