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My ThinkPad 2647 (PIII) uses memory with the following specifications,
according to the Lenovo website:

* 100MHz Synchronous DRAM (SDRAM)
* Two-bank memory design organized as 32M x 64
* Low-power consumption DRAM
* Serial presence detect/decode
* 144-pin JEDEC/JEDIA standard SoDIMM interface
* Gold-plated leads

I picked up a stick of Kingston KVR133X64SC3/256 to replace one of the
128MB sticks in one of the two slots on the motherboard. Here are the
specs on the Kingston memory:

256MB 133MHz Non-ECC CL3 SODIMM, Standard 32M X 64 Non-ECC 133MHz
144-pin Unbuffered SODIMM (SDRAM, 3.3V, CL3, Gold)

The Kingston memory is not compatible with the Lenovo/IBM 2647. Why not?
I don't see the problem.

mcp6453 wrote:
> My ThinkPad 2647 (PIII) uses memory with the following specifications,
> according to the Lenovo website:
>
> * 100MHz Synchronous DRAM (SDRAM)
> * Two-bank memory design organized as 32M x 64
> * Low-power consumption DRAM
> * Serial presence detect/decode
> * 144-pin JEDEC/JEDIA standard SoDIMM interface
> * Gold-plated leads
>
> I picked up a stick of Kingston KVR133X64SC3/256 to replace one of the
> 128MB sticks in one of the two slots on the motherboard. Here are the
> specs on the Kingston memory:
>
> 256MB 133MHz Non-ECC CL3 SODIMM, Standard 32M X 64 Non-ECC 133MHz
> 144-pin Unbuffered SODIMM (SDRAM, 3.3V, CL3, Gold)
>
> The Kingston memory is not compatible with the Lenovo/IBM 2647. Why not?
> I don't see the problem.

http://www.crucial.com/

That's where you get memory that's not going to give you any problems.