updated 09:35 am EDT, Tue April 17, 2001
Apple last week quietly posted more official information about its RAM-disabling firmware update in its Tech Info Library:
The Apple 4.1.7 and 4.1.8 firmware updates incorporate a number of fixes that dramatically improve system stability and performance. The update also includes a check that validates whether the memory installed in the computer is compatible. This check was added to help alleviate random crashes and stability issues. This memory test disables memory DIMMs that are found to be out of specification, and DIMMs that cannot be determined to be compatible. As a result, some third-party memory that was recognized by previous versions of firmware may no longer be recognized after the updates.