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The logic board uses JEDEC-standard 64-bit (non-parity) 168-pin 3.3-volt unbuffered SDRAM DIMM cards. Because the maximum amount of devices supported on a DIMM is 16, 256 MB SDRAM DIMMs require 128 Mbit devices. For information about DRAM DIMM configurations supported on the Power Macintosh G3 logic board, see RAM DIMMs .
The maximum supported height of RAM DIMM cards depends on the enclosure. The maximum height of RAM DIMMs in the Power Macintosh G3 desktop enclosures is 1.15 inches. The maximum height of RAM DIMMs in the Power Macintosh G3 tower and all-in-one enclosures is 1.5 inches.
The Power Macintosh G3 back-side L2 cache is integrated into the design of the microprocessor module. No cache expansion is possible.
The CD-ROM drive is an ATAPI CD-ROM drive, rather than a SCSI drive. The system software release includes version 4.0 of the ATA Manager and supports PIO, singleword DMA, and multiword DMA data transfers.