Posted on 2004-11-05
Last Modified: 2012-06-27
Is is possible to replace the CPU in a Thinkpad 600X with a faster model?  I like the computer, but would like it to run a bit faster.
Question by:jampolis
    LVL 34

    Expert Comment

    lt depends on what you have now looks like the biggest it supports is Intel Mobile Pentium III processors 650 MHz, and one of those maybe hard to find. how much memory do you have? upgrading that can improve performane also.

    Author Comment

    I believe that's what it has now.  Memory is 512mb.  I was hoping there was a faster chip.
    LVL 38

    Expert Comment


       It depends on what your motherboard can support how fast CPU.
    Anyway, there are a lot of ways to speed up your PC. You might want to check the internet for (Windows optimization).
    You will get some very useful information to speed up your PC without upgrade the hardware.

    LVL 9

    Accepted Solution

    The ThinkPad 600X (I should know, I have two!) uses Intel's MMC-2 CPU module with a Pentium III.

    The fastest module you can use is the 850MHz PIII. That's about 30% faster if you're doing number crunching (like making MP3 files). 850MHz PIII MMC-2 modules are VERY rare and expensive when you can find them. It is often cheaper to buy a broken laptop with one in it than just the CPU.

    However, 800MHz modules are much more common and reasonably priced. I bought mine off eBay for $49 and it was easy to swap in.

    Here's IBM's Hardware Maintenance Manual for your 600X:

    Page 60 of the PDF tells you how to remove the CPU module. Note that first you have to remove the other listed parts IN ORDER.

    Work on a large clean surface because the screws are tiny. Be careful if you want to keep the cosmetic screw covers because they are very delicate and difficult to remove without damaging them.

    Put screws in little piles for each step so you know where they go.

    IBM says you should throw away the screws and buy new ones, but I'm still using my original screws.

    Also consider buying more RAM if your usage will make it help. You can put two 256MB PC100 144-pin SO-DIMM memory sticks in that machine, with the 64MB built-in for a total of 576MB.

    Author Comment

    Thanks for the info.  I have a full memory complement, but the location of instructions, and the CPU info are invaluable.  Much appreciated!
    LVL 9

    Expert Comment

    If you haven't already, be sure you have the latest BIOS BEFORE you upgrade the CPU. It's needed to recognize the faster CPU.

    Go to and enter your machine type (2645-5FU or whatever) and look at downloads to get a list of BIOS, drivers and configuration files for your machine.

    Author Comment

    Thanks again.  Will do.

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