Toshiba Sat Pro 4600 Memory Upgrade

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My Toshiba 4600 takes up to two 256MB PC-100 SODIMMs, 512MB total max,
apparently. I put two 256MB Infineon PC-100 SODIMMs in and they didn't work!
So I put one 256MB Kingston PC-133 stick and one OEM 128MB Toshiba PC100
stick in and it works fine. WTF?!

I'm going to say that the Tosh 4600 doesn't like that particular brand,
can't remember the model but I know it was Infineon PC100, CL2.


Re: Toshiba Sat Pro 4600 Memory Upgrade

It's not about the "brand", it's about the internal architecture.  For
example, I bought 5 sticks of 128 MB PC-100 on E-Bay last week, Micron,
4 are one kind, and the 5th is a slightly different variant.  It has a
different suffix, one letter different, but the boards are identical and
the chips are identical.  The difference must be in the programming of
the SPD chip on the board (a chip that "describes" the module to the
computer).  And, in another transaction, I bought 3 more chips, also
Micron 128MB SDRAM, but these 8 chips on them (the other 5 modules have
only 4 chips on each module).

None of the 5 4-chip modules work in any of the several different types
of older Toshiba satellite laptops I bought them for, but the 8-chip
modules work fine.  The one "different" 4-chip modules does work in a
later (but still old) 2805, while the other 4 4-chip modules dont.
Because there are more "make or break" paramters to a memory module than
you have any idea of (there are dozens).

The computer "cares" about things you not only don't know, but that you
didn't even know existed (like is a 16M chip within the module organized
as 4Mx4 or 2Mx8 ... both 16k chips, within a 64MB or 128MB module).
Details you know know about and can't easily determine, but they make
the difference between working and not working.

There are only two solutions to this:

1.  Trial and error

2.  Buy from a seller who can assure you that the chip that they are
selling you will work in your particular make/model of laptop.

Steve Mackie wrote:
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