Re: Which CPU can i use?
- From: nospam@xxxxxxxxxx (Paul)
- Date: Wed, 28 Sep 2005 17:04:11 GMT
In article <1127920700.074310.3650@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>,
henrik1234567890@xxxxxxxxx wrote:
> I'm not sure i understand the part: "IIRC the P4B266
> only supports FSB400 officially, FSB533 is not unlikely to work too"
http://support.asus.com.tw/cpusupport/cpu_support_right.aspx?type=1&model_name=P4B266&SLanguage=en-us
When a computer first starts to run, the BSEL pins from the
processor, are used to program the clock generator.
BSEL1 BSEL0 Function
L L 100MHz (=FSB400)
L H 133MHz (=FSB533)
H L 200MHz (=FSB800)
H H ?
The question is, will the clock generator use a low frequency
when it encounters BSEL values it doesn't expect ? If the
nominal frequency is used, perhaps the chipset cannot run at
that high a frequency (i.e. your chipset might work up to
160MHz, but if the clockgen supplies 200MHz, the chipset
will not work properly).
For a processor to work, the BIOS code must recognize it. You
could get a black screen on the computer, simply because some
registers in the processor contain values the BIOS code
does not expect.
Finally, even if the BIOS finishes POST (power on self test),
there is a minor issue of microcode patch support for your
processor. Asus BIOS have a module inside the BIOS image,
called cpucode.exe, and it contains microcode patches. These
microcode patches are used to correct errors in processor design,
and a tool like CTMC can be used sometimes, to add new microcode
to the BIOS. For an OS like WinXP, there is a feature in WinXP
where microcode is added by the OS, leaving only a small window
(i.e. the booting period) where the processor is not properly
patched for errors.
Another issue, is whether the Vcore circuit can handle the
voltage request from your processor, but that tends to be
more of an issue with the use of CeleronD on old boards.
The Vcore circuit also has a limited number of amps of current
to offer a processor, but as you likely won't be running
the processor at full speed, that should not be an issue.
So, plug it in and try it, but do not be surprised if it
doesn't work.
Paul
.
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