Re: Wrong CPU being shown by the BIOS
- From: Paul <nospam@xxxxxxxxxx>
- Date: Mon, 29 Sep 2008 15:49:24 -0400
On Sep 29, 1:32 pm, "Dave" <no...@xxxxxxxxx> wrote:"ipleb" <pleb...@xxxxxxxxx> wrote in message
Hi allYes, the BIOS makes a guess as to what CPU is installed based in part on
I have an Asus P5N motherboard with an Intel Core 2 Duo E4300 1.86ghz
Socket 775 FSB800 CPU. All was working fine ... until recently when I
installed an extra gig of RAM which put the system total at 3gig - the
PC runs Vista home pre.
Now I am not sure if installing the RAM did this or messing about in
the OC settings of the bios, but everytime the PC boots it halts at
the BIOS screen with a message sayinh.
"Unknown CPU detected, install latest BIOS to unleash Power"
Now I have the latest BIOS installed but the problem seems to be that
the CPU is coming up as an Intel Xeon 4...@xxx ghz, 2 CPUs detected.
Vista also shows that an XEON is installed
Can anyone think why this has happened?
clock frequency and multiplier, along with other settings you might "tweak"
when you are overclocking. Apparently, in messing around with the OC
settings, you have stumbled upon settings that closely match the specs of a
Do you know how I could work out what the original settings the actual
CPU would be?
Just for chuckles, (assuming you get it running again), why not run the
Intel Processor Identification Utility.
(Supported processors list)
That utility should be using the ideas in this document. Intel
provides assembler and C code identification sequences, for their
processors. BIOS designers are supposed to incorporate these
ideas, as part of the BIOS design.
"AP-485 Intel Processor Identification and the CPUID Instruction"
Processor identification is also addressed here, in the thousands
of pages of docs.
As an example, the Xeon X3220 and the Q6600, are suspected to be
very similar. They're both LGA775, and overclockers have tried
both of them in desktop boards.
Here is an X3220 -
And here, a Q6600 -
So while the basic CPUID info looks the same, the Intel utility
can still tell the difference. There must be a secondary indicator
somewhere, that is giving it away. And it won't be solely frequency
- the multiplier and multiplier range prevent overclocking from
hiding the identity completely. (I'm not sure if BSEL is
protected and available inside the processor or not - BSEL
are the pins on the processor, that announce the nominal
So I'd be curious what the Intel Utility (and perhaps CPUZ) think.
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