X21 adding 512Mb low density 16 chips ram module possible?

[corco]

I have been searching a lot in this forum about upgrading memory in my X21.
If I understand OK from the posts of other people, the X20 and X21 only accept SO-dim 144pins low density (8 chips in each side).
256Mb modules of this kind are known to work, but what about if one could find 512Mb so-dims low density (8 chips in each side).
Would it work?

[n00b1337]

i think the 512mb ram chip will work but not all of the memory will be recognized because the max ram possible on the x21 is 384mb.

[corco]

I read in a POST that the chipset can handle more than 384MB memory. Is this figure then a BIOS issue?