Do you know the make and model of your mobo? If so, what is it? If it
can handle up to 256MB per DIMM slot, it can't be that old. We should
be able to find information about it somewhere.

"Kris" wrote in message
om...
"Mike Mastro" wrote in message
. net...
Your problem most likely lies within the density of the memory chips on
the
actual DIMM. First of all, you are correct that each slot will only
take
256MB modules. So, right there you know you aren't going to use all of
the
512MB stick. However, the density of the actual chips also makes a
difference. Either way, if you want to make sure to get the correct
memory, Crucial has a motherboard selector (www.crucial.com) which they
guarantee so that you buy the correct memory.

Thanks for this link, but I already searched a lot of sites to find
info about my mobo, but (as on crucial.com) it is not listed anymore.
How can I find out information on the density of my memory and about
the maximum density supported by my mobo? Are there any tools?