gollum

You'll probably be able to use up to 256 MB. Max module size is 128 MB.
Some 2137s *may* only be able to handle 64 MB, but it's still very likely
that it will handle 256 MB even if the manual only says 64 MB.

Note that only 64 MB is cacheable, so the RAM above 64 MB will be slower.

Also check the Google archives on this NG:
http://groups.google.com/groups?q=2137+RAM&group=alt.comp.hardware.aptiva