WinXP System Properties CPU error

[Larc]

I recently overclocked a Pentium D 945 from 3.4GHz to 3.6GHz by increasing CPU
external frequency from 200 to 212 MHz. Although the CPU speed now shows as
3.6GHz on the post screen and according to Sisoft Sandra after XP has started,
the general tab of System Properties shows the CPU designation correctly but now
indicates 2.52GHz as the operating speed as follows:

Computer:
Intel(R)
Pentium(R) D CPU 3.40GHz
2.52GHz, 1.00 GB of RAM

Another Pentium D 945 overclocked the same amount in another computer correctly
shows 3.6GHz as the operating speed.

Any ideas what's wrong? Is System Properties in error on the computer showing
2.52GHz?

The motherboard is an Asus P5P800-VM.

Larc



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[Larc]

| I recently overclocked a Pentium D 945 from 3.4GHz to 3.6GHz by increasing CPU
| external frequency from 200 to 212 MHz. Although the CPU speed now shows as
| 3.6GHz on the post screen and according to Sisoft Sandra after XP has started,
| the general tab of System Properties shows the CPU designation correctly but now
| indicates 2.52GHz as the operating speed as follows:
|
| Computer:
| Intel(R)
| Pentium(R) D CPU 3.40GHz
| 2.52GHz, 1.00 GB of RAM
|
| Another Pentium D 945 overclocked the same amount in another computer correctly
| shows 3.6GHz as the operating speed.

Oops! Ignore. I found the "problem." Intel SpeedStep is turned on in the
computer showing the lower operating speed, but not in the computer that
doesn't. When I turned off SpeedStep and checked, readings were correct.

It's just the system doing exactly what it's supposed to do.

Larc



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[DaveW]

That CPU design incorporates "speed stepping". If the CPU is overtaxed by
its workload, or overclocking, it automatically begins scaling back its
clock speed to keep the CPU safe.

 

[Larc]

| That CPU design incorporates "speed stepping". If the CPU is overtaxed by
| its workload, or overclocking, it automatically begins scaling back its
| clock speed to keep the CPU safe.

EIST (Enhanced Intel SpeedStep Technology) does that and more. It can reduce
voltage and core frequency when the CPU isn't being called on to work hard.
That's what was happening when I saw CPU level registering as 2.52GHz instead of
3.60GHz. I really knew EIST was turned on since I'm the one who did it, but
that fact had hidden itself in the back of my mind for a bit.

http://www.intel.com/cd/channel/reseller/asmo-na/eng/203838.htm

Larc



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