T40 CPU Upgrade

T4x series specific matters only
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chaistt
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T40 CPU Upgrade

#1 Post by chaistt » Wed Sep 27, 2006 1:18 pm

How does one get a Pentium M 2.0GHz (533MHz FSB - Dothan) to run at full speed in a T40 which has a FSB of 400MHz? I have the latest BIOS and IBM embedded chip updates.

RoadHazard
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#2 Post by RoadHazard » Wed Sep 27, 2006 1:39 pm

It's not a good idea to use a chip with 533Mhz FSB with a T40. There are chips with 400MHz FSB availables such as P-M 755 (2.0GHz) and P-M 765 (2.1GHz). I would use one of those instead.
-T42p 2374-D03 with Pentium M 765 2.1GHz, 1.5GB RAM, 7k60 HDD, IBM 802.11 a/b/g II wireless, 6-cell battery, and no touchpad
-X61 Tablet 7764-CTO with 3GB RAM and 7k200 HDD
-W500 4061-CTO all stock

cmarti
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Re: T40 CPU Upgrade

#3 Post by cmarti » Wed Sep 27, 2006 1:57 pm

chaistt wrote:How does one get a Pentium M 2.0GHz (533MHz FSB - Dothan) to run at full speed in a T40 which has a FSB of 400MHz? I have the latest BIOS and IBM embedded chip updates.

No it will run but at a lower speed with a 400fsb, so it is not a good upgrade.
X32/2.0GHZ/2GB/ENGENIUS EMP-8602+S 600mw mini pci/WD 250GB
X60/1.83GHZ/2GB/Atheros/7K100

lithium726
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#4 Post by lithium726 » Wed Sep 27, 2006 10:28 pm

Its not possible. The i855PM does not support the voltage signaling of the 533FSB chips to boot up at 533FSB. Im sure it would be stable if it was supported, but it is unfortunatly not.
Thinkpad T60 2613-CTO (2\4m\667, 3GB, 200GB 7200, DVD-RW DL, SXGA+, 3945ABG, 128MB x1400, GBe, BT IV)
Thinkpad T40 2373-PU7 (1.7\2m\400, 2GB, 120GB 5400, DVD\CDRW, SXGA+, Intel 2915ABG, 32MB MR7500, GBe, BT II)
Thinkpad T23 2648-PS1 (1.2, 512mb, 2915ABG)

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