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What is CPUID Value Limit Within the BIOS

#1 User is offline   coastie65 

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Posted 31 March 2008 - 08:19 AM

While browsing in my bios looking at several things on another question I noticed something under the advance tab. It was in Boot Configuration called MAX CPUID VALUE LIMIT and it was disabled. I have had that CPUID thing installed on here before my last mishap, but didn't see much to it except that it seemed to just ID my CPU. I am wondering just what that BioS thing is and what does it do if it is enabled. I have all kinds of ideas swirling around in my noggin, but none are probably even close to right, so thought I'd throw it out there for you guys. coastie65`
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#2 User is offline   techie4fun 

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Posted 31 March 2008 - 10:06 AM

Hi Coastie,

I haven't got any clue but I found this link;

When the computer is booted up, the operating system executes the CPUID instruction
to identify the processor and its capabilities. Before it can do so, it must
first query the processor to find out the highest input value
CPUID recognizes. This determines the kind of basic information CPUID can provide
the operating system.

The maximum CPUID input value determines the values that the operating system
can write to the CPUID's EAX register to obtain information about the processor.

This is where the Max CPUID Value Limit BIOS feature comes
in. It allows you to circumvent problems with older operating systems that do
not support the Intel Pentium 4 processor with Hyper-Threading Technology.
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#3 User is offline   coastie65 

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Posted 31 March 2008 - 10:14 AM

Thanx techie. That was my itchy curiousity at work and your response just scratched the itch. Enjoy "Dizzy World" coastie65
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#4 User is offline   techie4fun 

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Posted 31 March 2008 - 10:16 AM

LOL- it would have done the same to me. That's where the beauty of the world wide web comes in.

Glad to have served!
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#5 User is offline   coastie65 

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Posted 31 March 2008 - 10:21 AM

Yeah, I guess I was too lazy to do the search on my own, LOL. Again Thanx coastie65
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