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The Power Macintosh G3 computers include 2 MB of SGRAM on the main logic board. The video RAM can be expanded to 4 MB or 6 MB with an additional 2 MB or 4 MB of SGRAM on a 144-pin SO-DIMM (small outline dual inline memory module). The difference between supported display modes when using 4 MB or 6 MB of video memory is minimal, see Table 2 . However, 6 MB of SGRAM provides additional memory for storing 3D textures. The additional memory allocated for 3D texture storage results in increased 3D graphics performance for QuickDraw 3D aware applications.
The mechanical characteristics of the SGRAM expansion DIMM are given in the JEDEC specification for the 144-pin 8-byte graphics SO-DIMM. The devices on the DIMM must be 3.3 V, 100 MHz/10ns or faster, SGRAM devices. Additional information about memory devices and 144-pin SGRAM SO-DIMMs can be found at
http://www.jedec.org/download/freestd/pub21/4_5_8-R8.PDF