661-3444 512MB SDRAM, 184-Pin, DIMM, PC3200-DDR400, A1093 - PowerMac G5 Late 2004 NB-5321W
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: 661-3444
Compatible models: A1093
661-3444 512MB SDRAM, 184-Pin, DIMM, PC3200-DDR400, A1093 - PowerMac G5 Late 2004