661-3154 PC3200 DIMM, ECC-DDR400, SDRAM, 512 MB - A1068 Xserve January 2005 NB-2494W
This is a single 512MB DDR PC3200 DIMM chip. This is for use in desktop systems, and is not a SODIMM chip like laptops use.
Apple part number: 661-3154
Compatible models: A1068-M9743LL/A, A1068-M9745LL/A,
Compatible Mac info. : 2.0GHz Xserve G5 , 2.3GHz Dual Processor Xserve G5
661-3154 PC3200 DIMM, ECC-DDR400, SDRAM, 512 MB - A1068 Xserve January 2005