Upgrading TP 600 cpu to 400 mhz mmc-1

[beemer]

[mod edit: split from Official 600 Upgrade thread to focus discussion on problem]
Hi,
I am wondering if anyone here has run into problems upgrading a plain TP 600 cpu to the 400 mhz mmc-1.
I bought one off of Ebay and keep getting the "blue screen of death" that points to the cpu. When I reinstall the old cpu everything is OK.
I've updated to the latest BIOS, changed the RAM, reinstalled Windows and it is still the same.
I was wondering if you have to change something in the hex editor or something else I'm missing.
The only difference I see is the 400mhz has a L2 of 256k and the 300mhz has 512k.
Any help would be great.

[virge]

Is that 400Mhz module a Celeron? It's been a long time since, I've tried upgrading a TP600-- but I know not all Celeron models all compatible. Perhaps if you post some additional information regarding your CPU type, someone here may be able to offer advice.

[beemer]

Thanks for the response.
The part number is PMF40002001AA.
I believe it is a Pentium.

[hjanzen]

This is for sure a
Pentium 2
MMC-1
400MHz
256KB cache

See also:
http://www.cpu-world.com/info/id/Intel- ... processors

Hans

[beemer]

Yes,
This page gives the info.
http://www.cpu-world.com/CPUs/Pentium-I ... 001AA.html
Everything I've read leads to this just being a drop in, but it has not worked out that way and was hoping someone could give me a idea what I'm doing wrong.

[Unknown_K]

Is the heatsink making good contact? The only thing a higher value CPU of the same type will do is create more heat and use some current. You could try a different power brick to see if the one you have is marginal, or make sure you have a good battery installed to help.

[virge]

Also, how about disabling the on-board memory? Long shot, but worth a try.

[TTA]

I've done it 100's of times, I'd say you have a hardware problem.

[beemer]

1. The heat sink is properly installed and the battery is working well. It works over 1.5 hrs with the other CPU.

2. How would I go about disabling the on-board memory?

3.

I've done it 100's of times, I'd say you have a hardware problem.

You mean the 400mhz CPU right? Or something else on the motherboard?

Thanks

[TTA]

3.

I've done it 100's of times, I'd say you have a hardware problem.

You mean the 400mhz CPU right? Or something else on the motherboard?

Thanks[/quote]
The 4000MHz upgrade. The MMC 1 400MHz CPU we would pull from Toshiba Tecra 8000's put whatever CPU was in the thinkpad back in the toshibas then sell the toshiba's on ebay.

[beemer]

SOLVED: Returned CPU and got another one. Worked fine with no changes. Turned out to be a straight swap.
Thanks for everyone's input.

[TTA]

SOLVED: Returned CPU and got another one. Worked fine with no changes. Turned out to be a straight swap.
Thanks for everyone's input.

I figured that was your issue. Glad you got it figured out.