PowerBook 1400 Series: Maximum RAM Allowed (3/97)

I have a PowerBook 1400 with 40 megabytes of memory and would like to add more memory to it. I would like to add another 32 megabytes, bringing the total memory up to 72 megabytes.

The technical specifications state that the PowerBook 1400 supports a maximum of 64 megabytes of memory. Will there be any adverse effect if I attempt an upgrade to 72 megabytes?
The maximum amount of total memory supported by Apple in the PowerBook 1400 is 64Mb. Individual cards may contain up to a maximum of 48Mb of DRAM.

Any combination of RAM, including the DRAM soldered to the main logic board (8Mb), the DRAM installed by Apple in the Apple factory slot (4Mb or 8Mb), and User installable RAM cards must not exceed a total of 64Mb of RAM.

Using combinations of RAM that go over the specified 64Mb limit is not supported by Apple Computer and may result in random errors.
Published Date: Feb 18, 2012