In early 1998, Apple made a 233 MHz tower model available, and added a host of new add-on features for all models including a 4 GB fast/wide SCSI disk, and a faster graphics card. The Gossamer motherboard had 3 industry-standard SDRAM slots, allowing for 384 MB of RAM, but due to the height restrictions of the case, the G3 Desktop could not hold 128 MB modules, giving it a maximum of 192 MB (Low-profile modules have since been released).
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The G3 MiniTower model, which initially was only available at 266 MHz, had a different personality card, which offered all the features of the desktop card, plus 4 MB of VRAM (expandable to 6 MB) and S-Video In and Out.
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The PowerMac G3 Desktop, available at 233 or 266 MHz came with 16-bit Audio In and Out on a separate "personality" card and an internal Zip drive (The Gossomer motherboard was so small that the main HD could be mounted on the floor of the case, leaving room for the Zip, and an additional half-height drive). The G3 came in either a mini-tower case (similar to that of the 8600 & 9600, but shorter) or a 7300-style desktop case, and operated at either 233 or 266 MHz, with a 512 kB backside cache operating at 117 and 133 MHz, respectively. The 750 was co-designed by IBM and Motorola, and was the first processor capable of using a "backside" cache, which could communicate directly with the processor at extremely high speeds. Based on a newly designed motherboard (code-named "Gossamer") which ran at a blazing-fast 66 MHz, the G3 was the first Apple-branded Mac to ship with the new PPC 750 Processor.
The Desktop case for the PowerMac G3 weighed 22 lbs., and had the following dimentions: 6.3" H x 14.4" W x 16.9" DĪnnounced in November 1997, The PowerMac G3 knocked the 9600/300 out of the fastest-mac-on-the-planet mark by nearly 10%. Max Resolution: all resolutions supported VRAM: 2 - 6 MB (2 MB onboard, one socket) Level 1 Cache: 32 kB data, 32 kB instructionĮxpansion Slots: 3 PCI, 1 personality (filled)