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How much memory can I add?

I tried upgrading a Pentium III to 512 MB RAM - it's a Packard-Bell Multimedia 6500 - serial number H293400364 - 500 Mhz
It wouldn't start with 512 (2 x 256) or even just one 256. I have it running at the moment with 256 - (2 x 128)
I've upgraded lots of P III's to 512 with the same sticks and even P II's with no problems.
How can I find out what the limits are for this computer?
Are there sometimes jumpers to change or something like that to allow the upgrade?

Hope to hear from you
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keithbraithwaiteAuthor Commented:
... found that this set is limited to 256 MB on this page:


Sorry to have bothered you

All the best

Well, perhaps not.

This system may use the Intel "BX" chipset.  The BX was designed for memory modules of 128 megs or less, you have two slots, so that's 256 megs.

BUT .......

The BX chipset could actually take modules of 256 megs each (which would give you 512 megs) ***IF*** those modules were made up of 16 chips of 16 megabytes each.  Now most "modern" SDRAM 256 meg modules are made of 8 chips of 32 megs each, but if you find a module made from 16 chips .... it may work AND you may be able to use two of them.  Such modules do exist, they are not even that uncommon, but you do have to make sure that you have the right parts.

[This doesn't necessarily apply if the system doesn't use an Intel "BX" chipset.]
keithbraithwaiteAuthor Commented:
Thanks for the info - it's very helpful to keep acquiring information - the more I can get to know and understand about it all, the better.
The 256 modules I have seem to be 32M x 8 as you thought. They are IBM sticks marked:      256 MB  100 MHz  (32M x 72)  3.3 v  S E
Curiously enough there are 18 chips which all look identical whereas on all my 64 and 128 bars there are 8 or 16...
Each chip has a code marked on it 48LC16M8A2

In the  (32M x 72) what does the 72 mean?  On my 64 M modules it's marked (8M x 64) for instance. They are also IBM bars.
I never really know the value of these memory bars is unless its written there in black and white.
I think I've understood the principle but I have some modules which don't have any indication on the chips.
I'll give you the points - I was wondering what to do with them :)

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