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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 mechanical design of the SGRAM SO-DIMM is defined by the JEDEC MO-190 specification. The SGRAM SO-DIMM specification can be downloaded at
http://www.jedec.org/download/freestd/pub21/4_5_8-R8.PDF
The devices on the DIMM must be 3.3 V, 100 MHz/10ns or faster, SGRAM devices.