T40 processor Upgrade

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atct86 · #1 Post by **atct86** » Thu Jan 06, 2005 3:10 am

Is it possible to replace my 1.5 ghz Pentium M (1MB L2 Cache) with a faster processor possibly with 2MB L2 Cache.

BTW - I have a Thinkpad T40 2373-MU4

pdudas · #2 Post by **pdudas** » Thu Jan 06, 2005 6:36 am

I have seen T40 with 1.8GHz Dothan.

It is not impossible.

zzyss · #3 Post by **zzyss** » Thu Jan 06, 2005 8:11 am

Do the higher speed Dothans run significantly hotter than the Banaias? I have a 1.5GHz Banaias, and looking to source a 2.0GHz Dothan later in life, when it gets a bit cheaper (and after my warranty expires).

pdudas · #4 Post by **pdudas** » Thu Jan 06, 2005 8:20 am

I had T40 with 1.5 Banias.

It seems to me that was cooler than my new T42 with 1.7 Dothan (both of them used on the Speedstep).

atct86 · #5 Post by **atct86** » Thu Jan 06, 2005 12:12 pm

I tried an expriemnt today. I put a 1.5ghz Dorthan into my T40 and it booted to Bios, but it shut down half way through the windows startup. What could the problem be?

The 1.5ghz Dorthan ws from an R51 and has .09 architecture where my processor has .13 architecture. Could this be of any problem?

dr.b · #6 Post by **dr.b** » Thu Jan 06, 2005 3:30 pm

Latest BIOS?

#7 Post by **jdhurst** » Thu Jan 06, 2005 3:41 pm

A 1.8GHz Dothan works on a T41 with the latest BIOS. To the first question, no, it does not run hotter. Very cool in fact at 37 degrees C most of the time, which is body temperature.

If your upgrade won't run, I concur with the advice to check the BIOS level. You for sure used thermal compound, right? Don't do this without thermal compound. Then, finally, you must consider that the chip or the installation was somehow faulty.

I did my own Dothan upgrade and it works great. ... JD Hurst

atct86 · #8 Post by **atct86** » Thu Jan 06, 2005 4:02 pm

My Bios is the most recent update.

I did use thermal compound.

ALso the dorthan processor i tried worked and still works in the R41.

atct86 · #9 Post by **atct86** » Sun Jan 09, 2005 6:37 pm

I really need to figure out if my bios 3.13 for a T40, can use the new Dorthan chips.

Also what is the fastes procssor that my laptop can cool.

sktn77a · #10 Post by **sktn77a** » Sun Jan 09, 2005 7:23 pm

The BOIS in the T40, T41 and T42 are the same. The upgrade should work just fine (?). Look back for posts by tselling and jdhurst on this.

zzyss · #11 Post by **zzyss** » Sun Jan 09, 2005 9:51 pm

Also, the obvious question: aside from ripping it out of another laptop, where would one acquire a processor all on its lonesome? I imagine it would be wallet-numbingly expensive too?

atct86 · #12 Post by **atct86** » Sun Jan 09, 2005 10:26 pm

I have found many pentium M's on ebay for 100-250.

lvlolvlo · #13 Post by **lvlolvlo** » Sun Jan 09, 2005 11:36 pm

newegg.com

http://www.newegg.com/app/ViewProduct.a ... rty&DEPA=1

AssPenny · #14 Post by **AssPenny** » Mon Jan 10, 2005 1:07 am

Yes, you can do a processor upgrade as long as the bios is updated first.

atct86 · #15 Post by **atct86** » Mon Jan 10, 2005 8:35 am

That what I thought.

When i put the 1.5 Dorthan processor in it seemed to work at first. Howveer halfway through the windows startup it suddenly powered off.

Does windows need to be reinstalled?

RS_003 · #16 Post by **RS_003** » Mon Jan 10, 2005 9:32 am

atct86 wrote:That what i thoght.

When i pur the 1.5 Dorthan processor in it seemed to work at first. Howveer halfway through the windows startup it suddenly powered off.

Does windows need to be reinstalled?

That might be the problem.

Try booting of a knoppix live linux cd

atct86 · #17 Post by **atct86** » Mon Jan 10, 2005 11:01 am

What is the Knoppix live linux cd?

AssPenny · #18 Post by **AssPenny** » Mon Jan 10, 2005 3:10 pm

Yep, that could be the problem.
Or, you might not have set the heatsink on the cpu properly and it overheats and shuts down. That part of the boot process is very cpu intensive.

atct86 · #19 Post by **atct86** » Mon Jan 10, 2005 4:15 pm

The heat sink and fat seemed to be set properly.

It would stay on for under 15 seconds so I cant see how heat is the problem.

Noknok · #20 Post by **Noknok** » Sun Jan 16, 2005 9:44 pm

So it IS possible to install a Dothan CPU into a T40? Great!

Heh, I'm new here (hello!), and this was exactly the information I was looking for

As I have searched for concrete data on this, I've seen plenty of contradicting accounts from various sources. Even after comparing the configuration specs from IBM and Intel, I haven't been 100% sure about the thing; for quite some time I was under the impression that the upgrade seems to be all right on T41/42 models and a bit on the shady side on the T40.

I have a T40 with a 1.3 GHz Banias, and I would love to install a faster Dothan. I have opened my T40 twice, installed a WLAN card, and I'm pretty comfortable with tinkering inside this machine. If the upgrade really works, I believe I'm going to do it next week.

But, as you can see, I'm still somewhat skeptical and wanted someone to personally blink me a green light to go ahead and do this

... Aren't there any voltage issues? After the switch, the speedstepping still evidently works as it is supposed to? I'd really appreciate any additional input on this.

atct86 · #21 Post by **atct86** » Mon Jan 17, 2005 12:06 am

is the reason that new high speed dothans have not been put in teh t42 becasue of heat issues?

If not can a 2.1ghz work in a t40

Noknok · #22 Post by **Noknok** » Mon Jan 17, 2005 1:16 pm

I would even settle for a 1.8 GHz Dothan. I'm using my T40 as a mobile audio workstation, overall being extremely happy with a system as trustworthy as this. Still, the adequate DSP performance boost from a 1.3 GHz Banias to the aforementioned CPU is bound to become more and more desirable as realtime algorithms are getting more math-intensive by the minute. Nevertheless, it would have to be possible without sacrificing stability.

This is interesting: in May 2004, it was notified in an Extremetech Dothan preview article, both in the test system summary and in the benchmark graphs, that the machine they used to peek into the performance of "Intel's New Pentium M CPU" was in fact an IBM Thinkpad T40. The CPU is listed as a "1.7GHz Dothan with 2MB L2 and 32KB L1 caches", and other than that, the setup seems to be a plain T40 machine.

T40 processor Upgrade

T40 processor Upgrade

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