Look at the serial number on the PowerBook 5300 logic board and use the chart below to determine which version of the logic board you have.
+=============+=======+======+=================+=========+===============+
| Apple Svc. | | | | Clock | Logic Board |
| Part Number | RAM | VRAM | Description | Speed | Serial Number |
+=============+=======+======+=================+=========+===============+
| 661-0989 | 8 MB | 512K | No chip on top, | 100 MHz | FCXXXXXX55Y |
| | | | just sockets | | |
+-------------+-------+------+-----------------+---------+---------------+
| 661-0990 | 16 MB | 512K | 4 RAM chips on | 100 MHz | FCXXXXXX4VX |
| | | | top, one VRAM | | |
| | | | socket | | |
+-------------+-------+------+-----------------+---------+---------------+
| 661-0991 | 16 MB | 1 MB | No sockets | 100 MHz | FCXXXXXX68J |
+-------------+-------+------+-----------------+---------+---------------+
| 661-0992 | 16 MB | 1 MB | No sockets | 117 MHz | FCXXXXXX55S |
+=============+=======+======+=================+=========+===============+