Installed Memory Not Showing

[Guest]

I have a Shuttle AV40R mobo and had 768 Mb of DDR 2100 installed (256Mb in
each of the three slots). I recenlty repalced one of the 256MB modules with
a 1 Gb module, however only 512Mb on the new module is showing up. Total
installed memory shows as only 1 Gb. The mobo manual states that any
combination of memory cards can be installed. Any suggestions as to what is
going on?

Thank you.

 

[Bob I]

Is perhaps a double sided memory card? And the motherboard only reads
one side. Please recheck the motherboard specs or contact Shuttle tech
support.

 

[Loren Pechtel]

I have a Shuttle AV40R mobo and had 768 Mb of DDR 2100 installed (256Mb in
each of the three slots). I recenlty repalced one of the 256MB modules with
a 1 Gb module, however only 512Mb on the new module is showing up. Total
installed memory shows as only 1 Gb. The mobo manual states that any
combination of memory cards can be installed. Any suggestions as to what is
going on?

Thank you.

What's the biggest chip the board supports?