Which CPU can i use?

  • Thread starter Thread starter henrik1234567890
  • Start date Start date
H

henrik1234567890

I have a P4B266 board.

A have a spare P4 3.0 GHz HT CPU. Can i use this on my board?
 
I have a P4B266 board.

A have a spare P4 3.0 GHz HT CPU. Can i use this on my board?
Click to expand...

If it's a Northwood, it may work at reduced frequency (IIRC the P4B266
only supports FSB400 officially, FSB533 is not unlikely to work too). Be
sure to flash the latest (beta) BIOS before attempting this... seems to
be 1011 beta 4 from Dec 2003.

Stephan
 
I'm not sure i understand the part: "IIRC the P4B266
only supports FSB400 officially, FSB533 is not unlikely to work too"
 
He means the 3Ghz CPU will run at 1.5GHz 400FSB instead of it's rated 3Ghz
800FSB due to the motherboard's design limitations, and that although not
officially supported by Asus the board may well run fine at 533MHz FSB to
give you a cpu speed of 2GHz.


Regards

Mark
 
I'm not sure i understand the part: "IIRC the P4B266
only supports FSB400 officially, FSB533 is not unlikely to work too"
Click to expand...

http://support.asus.com.tw/cpusuppo...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
 
Ok,

I currently have a 2GHz (no HT) CPU installed. I seems like it not a
good idea to put in the 3GHz HT CPU

correct?
 
Ok,

I currently have a 2GHz (no HT) CPU installed. I seems like it not a
good idea to put in the 3GHz HT CPU

correct?
Click to expand...

I think you can plug it in. But do not expect a miracle :-)
It will end up running slower than 3GHz, even if you
manage to get it to run. In terms of the odds, going from
most likely to start in the BIOS, to least likely to work:

1) 3.06GHz/FSB533/512KB cache (FSB533 is not too much of a stretch)
2) 3.0GHz/FSB800/512KB cache (what will the clockgen do ?)
3) 3.0GHz/FSB800/1MB cache (clockgen or power consumption ?)

Paul
 
Doh! - it didn't work.

I flashed the bios to "P4B266 Beta BIOS 1011.003 The Latest Beta
BIOS.". But when i install the new cpu i get an alarm sound.

Refering to the manual
(http://dlsvr02.asus.com/pub/ASUS/mb/sock478/p4b266/p4b266-100.pdf) it
sounds like: "Long beeps in endless loop - No DRAM installed or
detected" (page 3-1 in manual).

Putting the old cpu back, and it works like a charm.


Any suggestions?
 
Doh! - it didn't work.

I flashed the bios to "P4B266 Beta BIOS 1011.003 The Latest Beta
BIOS.". But when i install the new cpu i get an alarm sound.

Refering to the manual
(http://dlsvr02.asus.com/pub/ASUS/mb/sock478/p4b266/p4b266-100.pdf) it
sounds like: "Long beeps in endless loop - No DRAM installed or
detected" (page 3-1 in manual).

Putting the old cpu back, and it works like a charm.


Any suggestions?
Click to expand...

Upgrade the motherboard ? It is a shame to waste a good processor.

Paul
 
Back
Top