661-2898 A1047 256MB SDRAM, PC3200-DDR400, 184p, DIMM - G5 PowerMac June 2004 NB-5291W
This is a single 256MB DDR PC3200 DIMM chip. This is for use in desktop systems, and is not a SODIMM chip like laptops use.
Apple part number: 661-2898
Compatible models: A1047
661-2898 A1047 256MB SDRAM, PC3200-DDR400, 184p, DIMM - G5 PowerMac June 2004