Question about IBM ThinkPad T22 2647 Notebook

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IBM ThinkPad T22 Series (Type 2647) memory upgrade

On one of your posts (see above) a contributer #2 (TheAsterisk) claims - 'As a note, as long as both RAM modules are PC133, you can use that, too, but you're still limited to 2x256MB. PC133 seems to be more readily available for purchase and a good deal cheaper than PC100, so it's good to know.'

Is solution #2 correct?

I have just upgraded my IBM Thinkpad with 2x256Mb PC133 of RAM and it will not boot.

Running Win XP Home.

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Hold on a second.. I have fixed a number of T21's and I recall that these units are super anal about the type of RAM they use. I am pretty sure that they require PC100 and will not accept PC133.

One second.... Ok, I just opened up my T21 and it has FRU 20l0255 which is PC 100. Here is a link to the specs. I have tried using PC133 and the same think happens - just does not boot. Nothing.

Posted on May 17, 2009

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Oh, God, I screwed up royally. A whole lot of memory providers online make this claim, and as I'd had good experiences with them before, I very foolishly parroted their statements without testing it first myself. I really hope you can return the PC133, and I hope I can return mine. I'm so sorry. Yes, PC133 seems to mess with the T22, now that I've tried it on mine. Everyone else coming here for help, ignore my earlier comment; it was ignorant, and it's likely to end up a waste of money. Unless IBM says otherwise, use only PC100. Again, I'm sorry if my malformed statement caused any headaches aside from my own.

Posted on Jun 10, 2009

  • TheAsterisk Jun 10, 2009

    Alright, according to the IBM ThinkPad forums and the official support site, PC100 will almost always work with a T22, but to use PC133 it MUST be low density ram. You and I (and perhaps others) may have bought higher density RAM by mistake, rendering the computers more or less useless, since the high-density sticks NEVER work on the T20/21/22.
    Ask or look for a low-density label or claim to be sure, if you still want to experiment with PC133 in your T22.
    Several users in the ThinkPad forum claimed that Crucial's memory worked well enough, but I'm at a loss as to other manufacturers. I haven't tried Crucial's modules myself, though, so exercise caution.

  • TheAsterisk Jun 10, 2009

    I found an easy way to tell high-density and low-density RAM apart visually, so hopefully I won't screw up again and neither will anyone else.
    High density RAM puts the same amount of memory into fewer chips than does low-density RAM.
    For example, a low-density 256MB PC100 or PC133 module will have 16 chips (that's usually how it's listed), with eight black squares visible on one side of the green plastic. The high-density RAM will have eight chips, with just four visible on one side.
    Whether you choose PC100 or PC133, it must be the low-density type for a T22.



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