From: James H. E. Maugham (CaptJHEM_at_waterw.com)
Date: Tue Sep 03 2002 - 10:41:49 EDT
Paul Khoury [mailto:pkhoury_at_earthlink.net] wrote:
> FWIW, does anyone know if you can go over 576MB on a 600X? Such as using
> 512MB SDRAM?
You can't use more than 256MB of RAM in the memory slot of any 600 series or
early T, A, X machines. This is a limitation inherent in the Intel 440BX chipset
that they're all built on. If there were more slots available, you could go up
to a Gig of memory. This is also the reason why the 600E and X max out at 556MB
and 576BM respectively as the onboard memory is "seen" and treated as an
additional memory slot.
In order to break this limit, you need the Intel 830XX chipset such as is found
in the A3Xx, T23, T3X, etc., all of which will take a Gig of memory.
As I reported a long time ago, two PC100 256MB sticks in a plain-jane 600
(2645-51U) result in only 425,408KB usable memory (BOOT 425,408KB, Installed
557,056KB, Usable 425,408KB) and the machine was _not_ stable under either W98
or W2K, throwing up repeated BSOD memory faults.
600 series machines built on the Intel 430TX chipset (2645-21U and 31U) max out
at 256MB installed memory with two PC66 128MB sticks as the TX chipset maps out
the onboard memory. 600 series machines built on the Intel 440BX chipset max out
at 288MB (BOOT 288,800KB, Installed 294,912KB, Usable 288,800KB) with the same
memory.
Some PC100 memory in BX based 600s can give differing results due to memory
density issues and report BOOT 228,800KB, Installed 294,912KB, Usable 228,800KB,
so one should try to only use PC66 memory in these machines.
600Es and 600Xs also have problems with memory density in some PC100 SO-DIMMs,
although memory from a known good vendor (Crucial, Kingston, Viking) shouldn't
be a problem and any 256MB memory shown for the 600X or early T series machines
will work in the 600E.
PC133 memory won't work in _any_ 600 series machine.
Regards,
James
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