The Xserve computer uses PC133 compliant, 184-pin DDR SDRAM DIMMs. The electrical characteristics of the DIMM are given in JEDEC specification JESD21-C, MODULES4_20_4, Release 11b. This specification can be found by using the search string “4_20_4” to search “By Document Number” in the JEDEC website at
http://www.jedec.org/DOWNLOAD/default.cfm
The mechanical characteristics of the DIMM package are given in JEDEC Standard MO-206. This specification can be found by using the search string “MO-206” to search “By Document Number” in the JEDEC website at
http://www.jedec.org/DOWNLOAD/default.cfm